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- W3133846506 endingPage "104914" @default.
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- W3133846506 abstract "Elevated arsenic concentrations (up to 19 μg L−1) occur in private groundwater wells in fractured bedrock aquifers close to the contact between Silurian greywackes of the Longford-Down Terrane, and the Palaeogene Slieve Gullion and Carlingford igneous complexes in NE Ireland. Palaeogene basaltic intrusions intersected in two drill cores were found to contain up to 80 mg kg−1 arsenic; concentrations that are elevated compared with the global averages for basalt. Fine grained (c. 5 μm) disseminated sulfarsenides, associated with cobalt and nickel were identified in the basalts as the primary sources of groundwater arsenic in this fractured bedrock aquifer system. Many of the high-As waters exhibit relatively high pH, arguing against a simple single-stage sulphide oxidation model for arsenic solubilisation. This observation coupled with the widespread presence of iron oxyhydroxide coatings on natural rock fractures intersected in the drill cores suggests a multi-stage As mobilisation process. This interpretation envisages sulfarsenide mineral oxidation, adsorption of dissolved As to iron oxyhydroxide mineral surfaces, and finally desorptive release of oxyanion As species from these surfaces as waters evolve to higher pH as a result of water-rock reactions." @default.
- W3133846506 created "2021-03-15" @default.
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- W3133846506 date "2021-04-01" @default.
- W3133846506 modified "2023-10-06" @default.
- W3133846506 title "As–Co–Ni sulfarsenides in Palaeogene basaltic cone sheets as sources of groundwater arsenic contamination in co. Louth, Ireland" @default.
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- W3133846506 doi "https://doi.org/10.1016/j.apgeochem.2021.104914" @default.
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