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Elevated arsenic in topsoils developed on an iron-rich sedimentary formation: From multi-scale spatial patterns to human bioaccessibility
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DOI:10.1016/j.apgeochem.2026.106943.png)
Abstract
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• Processes explaining topsoil As content are scale-related. • Topsoil As content can vary from 30 to 170 mg kg−1 over few 100’s m. • Regional uplift drove weathering profiles forming As-rich Fe oxyhydroxides. • Paleo-lateritic profiles may reconcentrate As • As occlusion in Fe oxyhydroxides controls its bioaccessibility.
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