{"type": "FeatureCollection", "features": [{"id": "10.1016/j.envpol.2024.125193", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:15:51Z", "type": "Journal Article", "created": "2024-10-24", "title": "Effect of particle size on the transport of polystyrene micro- and nanoplastic particles through quartz sand under unsaturated conditions", "description": "Micro- and nanoplastics (MNPs) are contaminants of emerging concern recently found in soil ecosystems. Their presence in terrestrial environments and their migration to aquatic environments may become a risk for the health of ecosystems and, through them, of humans. Understanding the interaction between particle properties and physicochemical and hydrodynamic factors is crucial to evaluate their fate and their potential infiltration towards groundwater. This study investigates the impact of particle size on MNPs transport through sand under unsaturated conditions. Infiltration column experiments with polystyrene MNPs ranging from 120 to 10,000\u00a0nm were conducted and supported by numerical modelling to derive reactive transport parameters. Results show a significant effect of particle size on the transport of MNPs, with higher recovery values observed for smaller particles (120\u00a0nm; 95.11%) compared to larger particles (1000\u00a0nm; 71.44%). No breakthrough was observed for 10,000\u00a0nm particles, indicating a complete retention within the quartz sand matrix. DLVO theory confirmed the dominance of electrostatic repulsive forces between MNPs and sand grains, suggesting an unfavourable environment for MNPs to adhere to quartz sand. Consequently, particle retention in the sand matrix occurs predominantly by physical processes. Equilibrium sorption modelling reveals that larger particles (1000\u00a0nm) tend to be immobilized in small pores throats due to straining, resulting in lower recoveries. When they are not trapped, particles tend to travel faster through preferential flows due to a size exclusion effect, evidenced by shorter arrival times at the column outlet compared to tracers. These findings highlight the influence of particle size on the transport and retention of MNPs in quartz sand under unsaturated conditions and contribute to a better understanding of their transport dynamics and environmental fate.", "keywords": ["Microplastics", "Q Science (General)", "Quartz", "particle size", "QS Ecology", "nanoplastics", "modelling", "Sand", "Polystyrenes", "Nanoparticles", "Soil Pollutants", "Particle Size", "Plastics", "Groundwater"], "contacts": [{"organization": "Rieckhof, Cynthia, Mart\u00ednez-Hern\u00e1ndez, Virtudes, Holzbecher, Ekkehard, Meffe, Raffaella,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1016/j.envpol.2024.125193"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Pollution", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.envpol.2024.125193", "name": "item", "description": "10.1016/j.envpol.2024.125193", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.envpol.2024.125193"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-01-01T00:00:00Z"}}, {"id": "10.1016/j.gca.2019.06.035", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:16:07Z", "type": "Journal Article", "created": "2019-07-02", "title": "Experimentally determined Si isotope fractionation between zircon and quartz", "description": "Abstract   The silicon isotope composition of detrital quartz and zircon have the potential to inform us about secular changes to the silica cycle and weathering reactions on Earth. However, inferring source melt Si isotope composition from out-of-context minerals is hampered by the fact that, to-date, there is limited Si isotope equilibrium fractionation data for minerals. Here, we report experimental data to constrain Si isotope equilibrium fractionation between zircon and quartz, using two fundamentally different strategies, but with the same experimental design. First, zircon and quartz were hydrothermally synthesized from Zr(OH)4 and SiO2 at 1.5\u202fGPa and temperatures of 725, 800, and 900\u202f\u00b0C. The second experimental strategy utilized the three-isotope method; the starting materials consisted of natural zircon and isotopically-labelled SiO2. Three sets of hydrothermal time-series experiments were conducted at the same pressure and temperatures as the direct synthesis experiments. For all experiments, quartz and zircon were separated and 30Si/28Si and 29Si/28Si ratios were measured by solution multi-collector inductively coupled plasma mass spectrometry. The three-isotope method, which provides the best indicator of equilibrium fractionations, yields the following relationship:        \u0394   30   S  i   (  q  t  z  -  z  r  c  )   =   (  0.53  \u00b1  0.14  )   \u00d7    10   6   /    T   2       where \u039430Si(qtz-zrc) is the relative difference in 30Si/28Si between quartz and zircon in permil, T is temperature in K, and the error is 2\u202fs.e. This relationship can be used to calculate the fractionation between zircon and other phases, and to estimate the Si isotope composition of the melt from which a zircon crystallized. The results may be used to assess equilibrium-disequilibrium isotope fractionations between quartz and zircon and co-existing phases in igneous rocks. These data can also be applied to out-of-context zircon (and quartz) to estimate the isotope composition of the host rock. Zircons crystallizing from a melt derived from purely igneous sources \u2013 i.e., without the involvement of \u201cweathered\u201d material \u2013 are expected to display a \u03b430SiNBS-28 (permil deviation of the 30Si/28Si from the NBS-28 standard) range from \u22120.7 to \u22120.35\u2030. Deviations from this range indicate assimilation of non-igneous (i.e., sedimentary) material in the melt source.", "keywords": ["Zircon", "GE", "550", "NDAS", "Quartz", "Si isotopes", "7. Clean energy", "01 natural sciences", "Three-istope", "[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "13. Climate action", "Igneous", "Three-isotope", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Fractionation", "GE Environmental Sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.gca.2019.06.035"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Geochimica%20et%20Cosmochimica%20Acta", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.gca.2019.06.035", "name": "item", "description": "10.1016/j.gca.2019.06.035", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.gca.2019.06.035"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-09-01T00:00:00Z"}}, {"id": "10.1016/j.radmeas.2019.106221", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:16:29Z", "type": "Journal Article", "created": "2019-11-19", "title": "Bleaching studies on Al-hole ([AlO4/h]0) electron spin resonance (ESR) signal in sedimentary quartz", "description": "Abstract   Electron spin resonance (ESR) dating of sediments using quartz is most commonly used for older sediments (>100 ka), since large residuals render the ESR signal unsuitable for dating young sediments. The multiple-centre approach (utilising both Ti and [AlO4/h]0 signals) is usually used to test the resetting of the signals used for ESR dating. Here we work towards a better understanding of, and correction for, the residual signal in ESR samples of sedimentary quartz. We undertook multiple-centre ESR measurements using quartz [AlO4/h]0 and Ti signals on young aeolian samples of different grain sizes which have been independently dated using optically stimulated luminescence (OSL). Our results demonstrate that [AlO4/h]0 signal yields residuals indicating equivalent doses of about 500\u00a0Gy, substantially older than expected for the known OSL equivalent doses in the range of 8\u201337\u00a0Gy. The decay of [AlO4/h]0 signal as function of bleaching time can be represented by an exponential function. We investigate the dependence of the residual magnitude of the ESR signal as a function of the previous given dose and observe an exponential increase in the residual signal with dose. Such observations are consistent with the results of luminescence process modelling conducted for a model comprising two luminescence centres and several traps, one of which is a so-called deep disconnected trap that cannot be emptied during optical stimulation. We propose that bleaching occurs through an electron-hole recombination process with electrons released from optically sensitive traps. In addition to our new insights into the bleaching mechanisms of the [AlO4/h]0 ESR signal, we discuss the implications for the procedures used for performing residual dose corrections in ESR dating. We recommend that modern analogues be used in addition to laboratory-bleached samples when performing residual dose corrections.", "keywords": ["ESR dating", "Sedimentary quartz", "03 medical and health sciences", "0302 clinical medicine", "Residual", "Sedimentary quartz ESR dating[AlO4/h]0 Residual Bleaching Modelling", "[AlO4/h]0", "Bleaching", "01 natural sciences", "Modelling", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.radmeas.2019.106221"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Radiation%20Measurements", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.radmeas.2019.106221", "name": "item", "description": "10.1016/j.radmeas.2019.106221", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.radmeas.2019.106221"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-01-01T00:00:00Z"}}, {"id": "10.1016/j.quageo.2018.07.011", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:16:29Z", "type": "Journal Article", "created": "2018-07-24", "title": "Luminescence age constraints on the Pleistocene-Holocene transition recorded in loess sequences across SE Europe", "description": "\u00a9 2018 The Authors Here we investigate the timing of the last glacial loess (L1) - Holocene soil (S0) transition recorded in loess-paleosol sequences from SE Europe (Ukraine, Romania, Serbia) by applying comparative luminescence dating techniques on quartz and feldspars. Equivalent dose measurements were carried out using the single-aliquot regenerative-dose (SAR) protocol on silt (4\u201311 \u03bcm) and sand-sized (63\u201390 \u03bcm and coarser fraction when available) quartz. Feldspar infrared stimulated luminescence (IRSL) emitted by 4\u201311 \u03bcm polymineral grains was measured using the post IR-IRSL290 technique. The paleoenvironmental transition from the last glacial loess to the current interglacial soil was characterized using magnetic susceptibility and its frequency dependence. SAR-OSL dating of 4\u201311 \u03bcm, 63\u201390 \u03bcm and 90\u2013125 \u03bcm quartz provided consistent ages in the loess-paleosol sites investigated, while the post-IR IRSL290 protocol proved unreliable for dating such young samples. Based on these ages and the threshold of the magnetic signal enhancement the onset of soil formation has been placed around 16.6 \u00b1 1.1 ka at Roxolany (Ukraine), 13.5 \u00b1 0.9 ka at Mo\u0161orin (Serbia) and between 17.6 \u00b1 1.4 ka and 12.4 \u00b1 1.0 ka at R\u00e2mnicu S\u0103rat (Romania). The trend observed in the magnetic parameters reflects the intensity of pedogenesis induced by regional climate amelioration during the Late Glacial, but the onset of magnetic susceptibility enhancement precedes the stratigraphic boundary of Pleistocene-Holocene dated at 11.7 ka in ice core records. Thus, magnetic susceptibility indicates a gradual increase in pedogenesis after Termination 1 (\u223c17 ka in the North Atlantic) at the sampling sites. Based on current data, it is not possible to define a synchronous threshold of change for all sections. However, the trend in the magnetic susceptibility data closely reflects the gradual transition from Last Glacial Maximum (LGM) towards the Holocene, with the onset of humus accumulation (A1 horizon) possibly linked to the prevalence of full interglacial conditions.", "keywords": ["PROTOCOL", "Luminescence dating", "Loess", "01 natural sciences", "Southeastern europe", "Magnetic susceptibility", "13. Climate action", "PROXIES", "QUARTZ", "/dk/atira/pure/sustainabledevelopmentgoals/climate_action; name=SDG 13 - Climate Action", "Pleistocene-holocene transition", "IRSL", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.quageo.2018.07.011"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Quaternary%20Geochronology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.quageo.2018.07.011", "name": "item", "description": "10.1016/j.quageo.2018.07.011", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.quageo.2018.07.011"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-02-01T00:00:00Z"}}, {"id": "10.1016/j.quageo.2022.101306", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:16:29Z", "type": "Journal Article", "created": "2022-04-13", "title": "Revisiting natural and laboratory electron spin resonance (ESR) dose response curves of quartz from Chinese loess", "description": "Natural and laboratory ESR dose response curves (DRCs) of [AlO4/h]0 and [TiO4/M+]0 were investigated for samples of quartz from the Luochuan loess-palaeosol master section, Chinese Loess Plateau. The natural and laboratory DRCs show a clear divergence above ~1000 Gy, with much lower D0 values and saturation levels observed for the natural DRCs, which is in agreement with the previous study by Tsukamoto et al. (2018). Young (&lt;15 ka) samples from Luochuan and Jingbian \u2013another site of the Chinese Loess Plateau, together with two modern samples of Chinese loess, were used to investigate the residual signals of [AlO4/h]0 and [TiO4/M+]0 centres. Our results are in line with published studies and show that the significant residual signals corresponding to several tens to hundreds of Gy are present in both Al and Ti centres. These need to be taken into account before laboratory DRC construction. ESR pulse annealing experiments performed on samples irradiated with different doses show an apparent dose-dependent thermal instability of [AlO4/h]0 and [TiO4/M+]0, with the signals for higher doses decaying faster with increasing temperature. We attribute the change in D0<br> with preheat reported in Tsukamoto et al., 2018, as well as the difference between laboratory and natural DRCs, to this apparent dose-dependent thermal instability of the signals. The saturation level of the natural DRC, being the result of reaching the equilibrium between filling of the traps and<br> emptying them due to thermal decay, is therefore additionally affected at higher doses, due to the increased thermal instability. The inability to recreate in the laboratory the same response to irradiation as the one observed in nature questions the accuracy of dating samples beyond 1000 Gy.", "keywords": ["Luochuan", "Dose response curve", "Loess", "Electron spin resonance (ESR); quartz; loess; Luochuan; dose response curve", "Quartz", "01 natural sciences", "Electron spin resonance (ESR)", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.quageo.2022.101306"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Quaternary%20Geochronology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.quageo.2022.101306", "name": "item", "description": "10.1016/j.quageo.2022.101306", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.quageo.2022.101306"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-05-01T00:00:00Z"}}, {"id": "10.1016/j.radmeas.2018.06.008", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:16:29Z", "type": "Journal Article", "created": "2018-06-05", "title": "Single and multi-grain OSL investigations in the high dose range using coarse quartz", "description": "Abstract   There is evidence that optically stimulated luminescence (OSL) dating of quartz using the single-aliquot regenerative-dose (SAR) protocol underestimates the equivalent dose (De) for paleodoses above 100\u2013200\u202fGy. Additionally, \u2018infinitely\u2019 old samples found not to be in laboratory saturation were reported. We present single and multi-grain SAR-OSL investigations for a coarse-grained (180\u2013250\u202f\u03bcm) quartz sample extracted from loess collected below the Brunhes/Matuyama transition at the Roksolany site (Ukraine). The sample was dated to more than 1000 ka by electron spin resonance using a multi center approach (Al and Ti signals), confirming that the De (\u223c2000\u202fGy) falls beyond the limit of standard OSL De measurement techniques. However, the natural signal measured using multi-grain aliquots of quartz was found to be below the laboratory saturation level. A comparison was made between synthetic dose response curves (DRCs) generated from single-grain and multi-grain aliquot data, respectively; the natural signal was found to be closer to the latoratory saturation level (92%) in the case of the single-grain synthetic DRC than for the multi-grain synthetic DRC where the signal was 86% of the saturation level. This difference could not be attributed to stimulation with different wavelengths, i.e. blue and green light stimulation for multi and single-grain measurements, respectively. By analysing synthetic data obtained by grouping grains according to their brightness, it was observed that brighter grains give a natural signal closer to the laboratory saturation level. This trend was confirmed for multi-grain aliquot data. Based on these findings we infer that variability in the contribution from populations of grains with different levels of brightness may represent a controlling factor in the closeness of the natural signal to laboratory saturation level for infinitely old samples.", "keywords": ["Multi-grain aliquots", "03 medical and health sciences", "0302 clinical medicine", "Quartz dose response", "\u2018Infinitely\u2019 old", "Optically stimulated luminescence (OSL)", "Saturation", "Single grains", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.radmeas.2018.06.008"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Radiation%20Measurements", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.radmeas.2018.06.008", "name": "item", "description": "10.1016/j.radmeas.2018.06.008", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.radmeas.2018.06.008"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-12-01T00:00:00Z"}}, {"id": "10.1029/2021gl095007", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:17:25Z", "type": "Journal Article", "created": "2022-03-31", "title": "A novel proxy for tracking the provenance of dust based on paired E1'-peroxy paramagnetic defect centres in fine-grained quartz", "description": "Abstract<p>Crystal lattice defects in quartz have long been exploited for age determination, yet\uffc2\uffa0also show potential for sediment provenance studies. Here, we introduce a novel method for tracking aeolian dust provenance by utilizing the natural accumulation of E1\uffe2\uff80\uff99 and peroxy defect centers in quartz. Our approach is based on the previously observed premise that E1\uffe2\uff80\uff99 and peroxy centers arise from Frenkel defect pairs, and that their concentration increases with the age of the quartz\uffe2\uff80\uff90bearing source rock. We propose that these defect centers can be utilized as a characteristic feature of the source rock and consequently, for fingerprinting sediments derived from it. We successfully apply our new protocol to distinguish fine\uffe2\uff80\uff90grained quartz extracted from loess deposits from two regions in Central Asia which are known to derive from different source material of differing age. Our method offers strong potential for identifying variability in source, both spatially and through time down sedimentary sequences.</p>", "keywords": ["020", "defect centers", "electron spin resonance", "provenance", "loess", "quartz", "01 natural sciences", "Provenance", " Quartz", " Defect centres", " Loess", " Electron Spin Resonance", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2021GL095007"}, {"href": "https://doi.org/10.1029/2021gl095007"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Geophysical%20Research%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1029/2021gl095007", "name": "item", "description": "10.1029/2021gl095007", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1029/2021gl095007"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-31T00:00:00Z"}}, {"id": "10.1111/bor.12442", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:18:28Z", "type": "Journal Article", "created": "2020-05-04", "title": "Testing polymineral post\u2010 IR IRSL and quartz SAR \u2010 OSL protocols on Middle to Late Pleistocene loess at Batajnica, Serbia", "description": "<p>The loess\uffe2\uff80\uff93palaeosol sequence of Batajnica (Vojvodina region, Serbia) is considered as one of the most complete and thickest terrestrial palaeoclimate archives for the Middle and Late Pleistocene. In order to achieve a numerical chronology for this profile, four sets of ages were obtained on 18 individual samples. Equivalent doses were determined using theSARprotocol on fine (4\uffe2\uff80\uff9311\uffc2\uffa0\uffce\uffbcm) and coarse (63\uffe2\uff80\uff9390\uffc2\uffa0\uffce\uffbcm) quartz fractions, as well as on polymineral fine grains by using two elevated temperature infrared stimulation methods,pIRIR290andpIRIR225. We show that the upper age limit of coarse quartzOSLand polymineralpIRIR290andpIRIR225techniques is restricted to the Last Glacial/Interglacial cycle due to the field saturation of the natural signals. Luminescence ages on coarse quartz,pIRIR225andpIRIR290polymineral fine grains are in general agreement. Fine quartz ages are systematically lower than the coarse quartz andpIRIRages, the degree of underestimation increasing with age. Comparison between natural and laboratory dose response curves indicate the age range over which each protocol provides reliable ages. For fine and coarse quartz, the natural and laboratory dose response curves overlap up to ~150 and ~250\uffc2\uffa0Gy, respectively, suggesting that theSARprotocol provides reliable ages up toc.\uffc2\uffa050 ka on fine quartz andc.\uffc2\uffa0100 ka on coarse quartz. Using thepIRIR225andpIRIR290protocols, equivalent doses up to ~400\uffc2\uffa0Gy can be determined, beyond which in the case of the former the natural dose response curve slightly overestimates the laboratory dose response curve. Our results suggest that the choice of the mineral and luminescence technique to be used for dating loess sediments should take into consideration the reported limited reliability.</p>", "keywords": ["Luminescence dating", " quartz", " feldspars", " loess", " Pleistocene", "Original Articles", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12442"}, {"href": "https://doi.org/10.1111/bor.12442"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Boreas", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/bor.12442", "name": "item", "description": "10.1111/bor.12442", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/bor.12442"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-05-04T00:00:00Z"}}, {"id": "10.3390/molecules27092683", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:20:52Z", "type": "Journal Article", "created": "2022-04-24", "title": "Dating sediments by EPR using Al-h centre: a comparison be-tween the properties of fine (4-11 \u03bcm) and coarse (> 63 \u03bcm) quartz grains", "description": "<p>The possibility of EPR dating for sediments using Al-h signals of fine (4\uffe2\uff80\uff9311 \uffce\uffbcm) grains of quartz has not been previously discussed. Here, the Al-h and peroxy EPR spectra of fine (4\uffe2\uff80\uff9311 \uffce\uffbcm) and coarse (63\uffe2\uff80\uff9390, 125\uffe2\uff80\uff93180 \uffce\uffbcm) sedimentary quartz from thoroughly investigated loess sites in Eastern Europe were examined. By comparing experimental spectra with a simulated signal, we evaluated the overestimation observed when using the standard approach established by Toyoda and Falgu\uffc3\uffa8res to measure Al-h intensity for different doses of radiation, up to 40,000 Gy. This overestimation, caused by the presence of peroxy signals, was much more pronounced for fine grains. Fine grains exhibited some additional dose-dependent signals, which, for some samples, caused a complete distortion of the Al-h spectra at high doses, making it impossible to measure the standard amplitude. We propose a new approach to measuring Al-h signal intensity, focusing on the peak-to-baseline amplitude of the part of the signal at g \uffe2\uff89\uff88 2.0603, which is not affected by the peroxy signals and therefore has the potential of providing more accurate results. The shapes of dose response curves constructed for coarse and fine grains using the new approach show considerable similarity, suggesting that Al-h centre formation in fine and coarse grains upon artificial radiation at room temperature follows the same pattern.</p>", "keywords": ["dose response curve", "fine grains", "Electron Spin Resonance Spectroscopy", "Organic chemistry", "Quartz", "electron paramagnetic resonance (EPR); electron spin resonance (ESR); quartz; Al-h centre; fine grains; dose response curve", "quartz", "01 natural sciences", "Article", "electron paramagnetic resonance (EPR)", "QD241-441", "Al-h centre", "electron spin resonance (ESR)", "Europe", " Eastern", "0105 earth and related environmental sciences"]}, "links": [{"href": "http://www.mdpi.com/1420-3049/27/9/2683/pdf"}, {"href": "https://www.mdpi.com/1420-3049/27/9/2683/pdf"}, {"href": "https://doi.org/10.3390/molecules27092683"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Molecules", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/molecules27092683", "name": "item", "description": "10.3390/molecules27092683", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/molecules27092683"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-04-21T00:00:00Z"}}, {"id": "10.3390/mps3010019", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:20:52Z", "type": "Journal Article", "created": "2020-02-28", "title": "Single Aliquot Regeneration (SAR) Optically Stimulated Luminescence Dating Protocols Using Different Grain-Sizes of Quartz: Revisiting the Chronology of Mircea Vod\u0103 Loess-Paleosol Master Section (Romania)", "description": "<p>The loess-paleosol archive from Mircea Vod\uffc4\uff83 (Romania) represents one of the most studied sections in Europe. We are applying here the current state of the art luminescence dating protocols for revisiting the chronology of this section. Analysis were performed on fine (4\uffe2\uff80\uff9311 \uffc2\uffb5m) and coarse (63\uffe2\uff80\uff9390 \uffc2\uffb5m) quartz extracts using the single aliquot regenerative (SAR) optically stimulated luminescence (OSL) dating protocol. Laboratory generated SAR dose response curves in the high dose range (5 kGy for fine quartz and 2 kGy for coarse quartz) were investigated by employing a test dose of either 17 or 170 Gy. The results confirm the previously reported different saturation characteristics of the two quartz fractions, with no evident dependency of the equivalent dose (De) on the size of the test dose. The OSL SAR ages are discussed and compared to the previously obtained results on quartz and feldspars. The previous reports regarding the chronological discrepancy between the two quartz fractions are confirmed. However, while previous investigations on other sites concluded that this discrepancy appears only above equivalent doses of about 100 Gy, here fine grain quartz ages underestimate coarse quartz ages starting with equivalent doses as low as around 50 Gy.</p>", "keywords": ["grain size", "QH301-705.5", "luminescence dating; loess; optically stimulated luminescence; single aliquot regeneration protocol; quartz; grain size", "luminescence dating", "optically stimulated luminescence", "Biology (General)", "loess", "quartz", "01 natural sciences", "single aliquot regeneration protocol", "Article", "0105 earth and related environmental sciences"]}, "links": [{"href": "http://www.mdpi.com/2409-9279/3/1/19/pdf"}, {"href": "https://www.mdpi.com/2409-9279/3/1/19/pdf"}, {"href": "https://doi.org/10.3390/mps3010019"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Methods%20and%20Protocols", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/mps3010019", "name": "item", "description": "10.3390/mps3010019", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/mps3010019"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-02-27T00:00:00Z"}}, {"id": "10.5281/zenodo.4536871", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:23:22Z", "type": "Journal Article", "created": "2021-05-01", "title": "Investigations on the luminescence properties of quartz and feldspars extracted from loess in the Canterbury Plains, New Zealand South Island", "description": "<p>The applicability of the single-aliquot regenerative-dose (SAR) protocol, by using the optically stimulated luminescence (OSL) signal of quartz as well as the post-infrared\uffe2\uff80\uff93infrared (pIRIR) signals of polymineral fine grains, namely pIRIR&lt;sub&gt;225&lt;/sub&gt; and pIRIR&lt;sub&gt;290&lt;/sub&gt;, was assessed for dating loess in New Zealand South Island. OSL signals of quartz grains displayed low sensitivity. However, the application of repeated irradiation/bleaching cycles did not result in an increase in sensitivity; annealing in the 300\uffe2\uff80\uff93500\uffc2\uffb0C temperature range generated the sensitisation of both the 110\uffc2\uffb0C thermoluminescence (TL) peak as well as the OSL signal, likely by activation of yet unidentified luminescence centres. After heating, the quartz signal is comparable to that of ideal samples, but the annealing is precluding successful dating. On the other hand, feldspar infrared-stimulated signals displayed satisfactory properties, allowing estimation of ages ranging from 14 \uffc2\uffb1 1\uffe2\uff80\uff9329 \uffc2\uffb1 3 ka for the investigated deposit. It was shown that pIRIR&lt;sub&gt;225&lt;/sub&gt; and pIRIR&lt;sub&gt;290&lt;/sub&gt; methods have potential for dating loess in the South Island of New Zealand, based on the following observations: (i) Dose recovery tests were successful with recovered-to-given dose ratios with a &lt;10% deviation from unity, (ii) constant residual values of about 4 Gy and about 10 Gy were obtained after exposures for 48 h in the case of pIRIR&lt;sub&gt;225&lt;/sub&gt; signals and 96 h in the case of pIRIR&lt;sub&gt;290&lt;/sub&gt; signals, respectively, (iii) while a slight dose-dependence of the residual was reported, and for a dose as large as 1600 Gy the residual values are \uffe2\uff89\uff859 Gy and \uffe2\uff89\uff8519 Gy for pIRIR&lt;sub&gt;225&lt;/sub&gt; and pIRIR&lt;sub&gt;290&lt;/sub&gt; signals, respectively.</p>", "keywords": ["Mass-wasting -- New Zealand", "quartz; feldspar; luminescence; sensitivity; loess; New Zealand", "Submarine topography -- New Zealand", "Landslide hazard analysis -- New Zealand", "Submarine geology -- New Zealand", "15. Life on land", "Marine sediments -- New Zealand", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://oceanrep.geomar.de/id/eprint/52652/1/10.2478_geochr-2021-0005.pdf"}, {"href": "https://oceanrep.geomar.de/id/eprint/52652/2/geochr-2021-0005_sm.pdf"}, {"href": "https://doi.org/10.5281/zenodo.4536871"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Geochronometria", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.4536871", "name": "item", "description": "10.5281/zenodo.4536871", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.4536871"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-04-30T00:00:00Z"}}, {"id": "39454816", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-26T16:26:32Z", "type": "Journal Article", "created": "2024-10-24", "title": "Effect of particle size on the transport of polystyrene micro- and nanoplastic particles through quartz sand under unsaturated conditions", "description": "Micro- and nanoplastics (MNPs) are contaminants of emerging concern recently found in soil ecosystems. Their presence in terrestrial environments and their migration to aquatic environments may become a risk for the health of ecosystems and, through them, of humans. Understanding the interaction between particle properties and physicochemical and hydrodynamic factors is crucial to evaluate their fate and their potential infiltration towards groundwater. This study investigates the impact of particle size on MNPs transport through sand under unsaturated conditions. Infiltration column experiments with polystyrene MNPs ranging from 120 to 10,000\u00a0nm were conducted and supported by numerical modelling to derive reactive transport parameters. Results show a significant effect of particle size on the transport of MNPs, with higher recovery values observed for smaller particles (120\u00a0nm; 95.11%) compared to larger particles (1000\u00a0nm; 71.44%). No breakthrough was observed for 10,000\u00a0nm particles, indicating a complete retention within the quartz sand matrix. DLVO theory confirmed the dominance of electrostatic repulsive forces between MNPs and sand grains, suggesting an unfavourable environment for MNPs to adhere to quartz sand. Consequently, particle retention in the sand matrix occurs predominantly by physical processes. Equilibrium sorption modelling reveals that larger particles (1000\u00a0nm) tend to be immobilized in small pores throats due to straining, resulting in lower recoveries. When they are not trapped, particles tend to travel faster through preferential flows due to a size exclusion effect, evidenced by shorter arrival times at the column outlet compared to tracers. These findings highlight the influence of particle size on the transport and retention of MNPs in quartz sand under unsaturated conditions and contribute to a better understanding of their transport dynamics and environmental fate.", "keywords": ["Sand", "Microplastics", "Polystyrenes", "Nanoparticles", "Soil Pollutants", "Q Science (General)", "Quartz", "QS Ecology", "Particle Size", "Plastics", "Groundwater"]}, "links": [{"href": "https://doi.org/39454816"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Pollution", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "39454816", "name": "item", "description": "39454816", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/39454816"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-01-01T00:00:00Z"}}, {"id": "82eb301a-4b26-4fae-9028-19387caf023a", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:28:14Z", "type": "Dataset", "language": "en", "title": "Habitats Quartzites: transects to sample the local environmental variability in March 2012.", "description": "The site Quartzites is composed of two 3km-transects (20m wide). 2638 trees with dbh>=20cm have been recorded by Office national des for\u00eats (ONF). No fauna inventories available. 276 under-storey plants have been recorded on 17 25m\u00b2-plots by Institut de recherche pour le d\u00e9veloppement (IRD). Soils have been described using 13 samples (1.20m depth max.) and two soil pits (1.50m depth). Laboratory analyses are available for one profile and for the two soil pits", "keywords": ["diameter-measurements", "dispositifs-forestiers-habitats", "forest-composition", "forest-structure", "fr", "labex-ceba", "local-coverage", "mesoscale-plot-network", "quartzites", "sampling-plots", "soil", "tree-community", "tree-flora", "tropical-forest-types"]}, "links": [{"href": "http://data.europa.eu/88u/dataset/82eb301a-4b26-4fae-9028-19387caf023a"}, {"rel": "self", "type": "application/geo+json", "title": "82eb301a-4b26-4fae-9028-19387caf023a", "name": "item", "description": "82eb301a-4b26-4fae-9028-19387caf023a", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/82eb301a-4b26-4fae-9028-19387caf023a"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"null": "date"}}, {"id": "ONF_Habitats_All", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:28:14Z", "type": "Dataset", "title": "Habitats: transects to sample the local environmental variability in French Guiana since 2005.", "description": "Habitats inventories have been installed over the years in French Guiana using a standardized multi-scale protocol. In each site, we established two to four transects, about 2.5 to 3-km long in different directions to optimally sample the local environmental variability. Each 20-m width transect was divided into 100 m segments so that the basic sampling units are 0.2-ha plots. All the plots were geo-referenced using a Garmin 76CSx GPS receiver and delineated in the field using a Vertex laser clinometer. In each plot, all trees (including palm-trees) greater than 20 cm diameter at breast height (DBH) or above the buttresses were identified by local forest-plotters from ONF. They referred to a vernacular nomenclature whose names correspond either to a botanical species, genus or family. Tested against true botanical data on 4279 trees (Guitet et al., 2014), this nomenclature proved 83% effective accuracy at the family level and 74% at the level of the most precise botanical equivalent of our vernacular names (i.e. the species, genus or family level depending on the precision reached by forest-plotters). Soil samples were also collected in 490 selected plots representative of the different topographical positions along each transect. Chemical and textural analyses are available. Plants of the under-storey have been collected by IRD in several 5m x 5m sub-plots on different sites : Kouroua\u00ef, Piton Baron, A\u00efmara, Saut Parasol, Mont Itoup\u00e9, Waki, Toponowini, Bagote, Haute Beiman, Roche Koutou, Regina. Standardized line transects surveys were conducted by ONCFS in 25 sites on the same transects in order to record large mammals and terrestrial birds. Transects were walked at less than 1 kmh-1 speed every morning (7:00-11:00) and afternoon (14:30-18:00) by only one observer by trail, systematically alternating transects on consecutive days to avoid observer bias. All encounters of focus species and their localization on the trail were systematically recorded and the perpendicular distance between animal and transect was measured with a laser ranger finder to the nearest meter.", "keywords": ["ai\u0308mara", "biogeographical-regions", "camp-cai\u0308man", "centre-spatial-guyanais", "crique-armontabo", "crique-bagot", "crique-bastien", "crique-plomb", "diameter-measurements", "dispositifs-forestiers-habitats", "eau-blanche", "forest-composition", "forest-structure", "fr", "galibi", "grillon", "haute-beiman", "haute-matarony", "ine\u0301ry", "kourouai\u0308", "labex-ceba", "limonade", "local-coverage", "manare\u0301", "maripa", "mont-itoupe\u0301", "montagne-tortue", "multiscale-network", "nouragues", "paracou", "pic-du-grand-croissant", "piton-baron", "piton-de-l'armontabo", "quartzites", "re\u0301gina", "roche-koutou", "sables-blancs", "saint-michel", "sampling-plots", "saut-parasol", "soil", "species-distribution", "toponowini", "tree-community", "tree-flora", "trinite\u0301", "tropical-forest-types", "waki", "yaroupi"]}, "links": [{"href": "http://data.europa.eu/88u/dataset/c2378bfa-c2b2-4cae-8d48-d982c7a81290"}, {"rel": "self", "type": "application/geo+json", "title": "ONF_Habitats_All", "name": "item", "description": "ONF_Habitats_All", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/ONF_Habitats_All"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"null": "date"}}, {"id": "6d2f9dcc3206843e4a962414751c303c", "type": "Feature", "geometry": null, "properties": {"license": "https://spdx.org/licenses/CC-BY-4.0.html", "updated": "2022-11-25T00:00:00Z", "type": "Dataset", "language": "fr", "externalIds": [{"value": "https://geodata.wallonie.be/id/f8a238fd-d87b-456f-be48-d6f96f83b4fe"}], "title": "INSPIRE - Areas occupied by working quarries between 2010 and 2020 in Wallonia (BE)", "description": "This INSPIRE compliant data layer represents the influence of active careers in Wallonia in 2020.  The initial list comes from the 2010 Poty Inventory.  This layer includes for each site in operation (= active quarries) the land occupied by:  - the extraction pit: this is the area where the stone is extracted, which itself includes the working floor (bottom), bearings, face faces including the excavation of waste rock (also known as dead ground);  - operating dependencies: all the facilities present on the quarry site and which enable the stone to be transformed into a finished or semi-finished product (breaking, screening, washing, concrete plant, coating, handling, stone working, workshops, garages, product stocks, car parks, processing plant, brick-making, lime kilns, etc.);  - operating waste rock depots, settling ponds, and runways allowing the movement of machinery within the holding and direct connections to the railway or waterway, buffer or isolation zones on the periphery of the site.   It is very important to point out that this layer does not correspond to the land covered by the permits, nor to the land listed in the area of extraction dependencies or in the area of extraction in the sector plan in force. Similarly, it is important to stress that this layer does not represent only the bare soils of active quarries.    The information awarded is the Poty ID (links to other parts of the study), the name of the quarry, the materials used and the family of rocks.", "formats": [{"name": "GEOJSON"}], "keywords": ["High value dataset", "ame\u0301nagement-du-territoire", "-urbanisme", "-ba\u0302timents", "-e\u0301quipements", "-logement", "ardoise", "argile", "arkose", "be", "calcaire", "carrie\u0300re", "coticule", "craie", "dolomie", "environnement", "exploitation-de-carrie\u0300re", "exploitation-minie\u0300re", "e\u0301conomie", "-business", "-pme", "-de\u0301veloppement-e\u0301conomique", "-emploi", "gre\u0300s", "industrie", "industrie-minie\u0300re", "kaolin", "lieux-de-production-et-sites-industriels", "limon", "marbre", "marbre-noir", "marne", "nuisance", "phyllade", "pierre", "pierre-naturelle", "pierre-ornementale", "porphyre", "psammite", "quartzite", "quartzophyllade", "re\u0301gional", "sable", "schiste", "silex", "sol", "terre-a\u0300-brique", "tuffeau"], "contacts": [{"organization": "Helpdesk carto du SPW (SPW - Secr\u00e9tariat g\u00e9n\u00e9ral - SPW Digital - D\u00e9partement Donn\u00e9es transversales - Gestion et valorisation de la donn\u00e9e)", "roles": ["creator"]}, {"organization": "https://org.belgif.be/id/CbeEstablishmentUnit/2204322327", "roles": ["publisher"]}]}, "links": [{"href": "https://geodata.wallonie.be/dataset/706cbad4-25ea-443e-a3ee-002c58deb63d"}, {"href": "https://geoservices.wallonie.be/geoserver/inspire_pf/ogc/features/v1/openapi"}, {"href": "https://geoservices.wallonie.be/geoserver/inspire_pf/ows?service=WMS&version=1.3.0&request=GetCapabilities"}, {"href": "https://metawal.wallonie.be/geonetwork/srv/api/records/706cbad4-25ea-443e-a3ee-002c58deb63d"}, {"href": "http://data.europa.eu/88u/dataset/https-geodata-wallonie-be-id-706cbad4-25ea-443e-a3ee-002c58deb63d"}, {"href": "https-geodata-wallonie-be-id-706cbad4-25ea-443e-a3ee-002c58deb63d"}, {"href": "https://geodata.wallonie.be/id/706cbad4-25ea-443e-a3ee-002c58deb63d"}, {"rel": "self", "type": "application/geo+json", "title": "6d2f9dcc3206843e4a962414751c303c", "name": "item", "description": "6d2f9dcc3206843e4a962414751c303c", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/6d2f9dcc3206843e4a962414751c303c"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"null": "date"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=quartz&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=quartz&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=quartz&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=quartz&offset=15", "hreflang": "en-US"}], "numberMatched": 15, "numberReturned": 15, "distributedFeatures": [], "timeStamp": "2026-07-26T18:47:55.883010Z"}