Sources and behavior of perchlorate in a shallow Chalk aquifer under military (World War I) and agricultural influences

Cao, Feifei; Sturchio, Neil C.; Ollivier, Patrick; Devau, Nicolas; Heraty, Linnea J.; Jaunat, Jessy

doi:10.1016/j.jhazmat.2020.123072

Cited by 10 publications

(3 citation statements)

References 58 publications

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“…, rendzina), developed on a chalk substrate from the Upper Cretaceous (≈100 to 65 million years ago). Details about the study site and the geological and geochemical settings are given elsewhere as well as preliminary results on the U distribution and aqueous and colloidal speciation in the subsurface and aquatic environment. ,− The vegetation on site is a dry grassland developed on thin chalky rendzina and calcisols more or less cryoturbated, with a low organic carbon content (total organic carbon mass content typically lower than 5%). Table S1 of the Supporting Information summarizes the essential information about the mineralogical and organic composition of the soil and the chalk substrate at the study site and their evolution along a vertical soil profile.…”

Section: Methodsmentioning

confidence: 99%

Uranium Speciation in a Chalky Soil

Bayle

Beccia

Moulin

et al. 2023

Environ. Sci. Technol.

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In this article, the speciation and behavior of anthropogenic metallic uranium deposited on natural soil are approached by combining EXAFS (extended X-ray absorption fine structure) and TRLFS (time-resolved laser-induced fluorescence spectroscopy). First, uranium (uranyl) speciation was determined along the vertical profile of the soil and bedrock by linear combination fitting of the EXAFS spectra. It shows that uranium migration is strongly limited by the sorption reaction onto soil and rock constituents, mainly mineral carbonates and organic matter. Second, uranium sorption isotherms were established for calcite, chalk, and chalky soil materials along with EXAFS and TRLFS analysis. The presence of at least two adsorption complexes of uranyl onto carbonate materials (calcite) could be inferred from TRLFS. The first uranyl tricarbonate complex has a liebigite-type structure and is dominant for low loads on the carbonate surface (<10 mgU/kg(rock)). The second uranyl complex is incorporated into the calcite for intermediate (∼10 to 100 mgU/kg(rock)) to high (high: >100 mgU/kg(rock)) loads. Finally, the presence of a uranium-humic substance complex in subsurface soil materials was underlined in the EXAFS analysis by the occurrence of both monodentate and bidentate carboxylate (or/and carbonate) functions and confirmed by sorption isotherms in the presence of humic acid. This observation is of particular interest since humic substances may be mobilized from soil, potentially enhancing uranium migration under colloidal form.

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Section: Methodsmentioning

confidence: 99%

Uranium Speciation in a Chalky Soil

Bayle

Beccia

Moulin

et al. 2023

Environ. Sci. Technol.

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“…(2006) estimated that the average annual US synthetic perchlorate production is about 10.6 Gg yr −1 , which is about 10 times the modeled atmospheric production. The leakage of synthetic perchlorate into groundwater systems has been reported (Cao et al., 2020; Urbansky, 2002). The direct release of synthetic perchlorate into the lower troposphere is also possible, for example, via fireworks and road flares (Munster et al., 2009; Munster & Hanson, 2009).…”

Section: Hypotheses For Explaining Discrepancies Between Observations...mentioning

confidence: 99%

Stratospheric Gas‐Phase Production Alone Cannot Explain Observations of Atmospheric Perchlorate on Earth

Chan

Jaeglé

Campuzano‐Jost

et al. 2023

Geophysical Research Letters

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“…Even several decades after their burying in the soil, explosives remain in good conditions and are still sensitive 5 . Today, these munitions are potential sources of contamination of soil 6,7 and groundwaters 8,9 , and raise public health questions 10,11 . It is thus relevant to explore more deeply the potential long-term effects of the WWI legacy on current ecosystems functioning.…”

Section: Introductionmentioning

confidence: 99%

Automatic extraction of former WWI battlefields from ancient maps

Paradelle,

Laslier,

DeCocq

2023

Remote Sensing for Agriculture, Ecosystems, and Hydrology XXV

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The former battlefields of World War I (WWI) provide an interesting framework for studying the long-term impacts of ancient anthropogenic disturbances on current ecosystem functioning. The 47 map sheets of devastated regions at 1:50,000 scale edited in 1920 by the geographic service of French army locate the areas heavily damaged by trenches and bombing, the destructed cities, roads and forests inventoried at the end of WWI. As they stand, these scanned maps are not usable under a geographic information system (GIS). A protocol was implemented on 5 sheets to compare the effect of two transformation models (thin plate spline and polynomial order 3) and the number of ground control points on the quality of georeferencing. A second protocol based on morphological operators, color space transformation and K-means clustering classification was tested on 12 different map sheets to extract areas heavily damaged and figures of punctual destructions. Neither significant effects of transformation model or number of ground control points were confirmed. The local thin plate spline method exacerbates non-natural local distortions linked to the research of ground control points and the simplification of physical objects on the maps. With polynomial order 3 transformation and 50 ground control points, residuals vary from 35 to 70 m depending on the map. The second protocol extracted accurately data of interest, with an accuracy varying between 0.31 and 100% depending on data to extract and their presence or absence on the map sheets. The resulting shapefiles are now available and workable in GIS.

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Sources and behavior of perchlorate in a shallow Chalk aquifer under military (World War I) and agricultural influences

Cited by 10 publications

References 58 publications

Uranium Speciation in a Chalky Soil

Uranium Speciation in a Chalky Soil

Stratospheric Gas‐Phase Production Alone Cannot Explain Observations of Atmospheric Perchlorate on Earth

Automatic extraction of former WWI battlefields from ancient maps

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