Pond-derived organic carbon driving changes in arsenic hazard found in Asian groundwaters.

作者: Michael Lawson , David A Polya , Adrian J Boyce , Charlotte Bryant , Debapriya Mondal

DOI: 10.1021/ES400114Q

关键词:

摘要: Microbially mediated reductive processes involving the oxidation of labile organic carbon are widely considered to be critical release arsenic into shallow groundwaters in South and Southeast Asia. In areas where there is significant pumping groundwater for irrigation involvement surface-derived drawn down from ponds underlying aquifers has been proposed but remains highly controversial. Here we present isotopic data two sites with contrasting histories that unequivocally demonstrate ingress surface pond-derived arsenic-containing groundwaters. We show transported depths up 50 m even an arsenic-contaminated aquifer Cambodia thought minimally disturbed by pumping. contrast, extensively exploited West Bengal, greater depths, excess 100 aquifer. Intensive may potentially drive secular increases hazard this region increasing contribution bioavailable dissolved these systems transporting it than would operate under natural flow conditions.

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