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Sediment heterogeneity drives divergent arsenic transformation pathways through organic matter-microbial coupling in aquifers
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DOI：10.1016/j.envpol.2026.128911.png)
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Abstract
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• Sediment heterogeneity controls arsenic speciation in high-As aquifers. • Organic matter evolution drives Fe-S-As coupling along groundwater flow. • Sulfate reduction and weak sulfur oxidation favor thioarsenate formation. • Arsenic resistance and efflux genes support methylated arsenic transformation. • Zone-specific indicators enhance arsenic risk assessment in heterogeneous basins.
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