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Abstract [1] Arsenic (As) concentrations and stable hydrogen ( δ 2H) and oxygen ( δ 18O) isotope ratios of surface and groundwaters from a representative site in West Bengal, India, are reported. Shallow groundwaters (≤35 m) from the study site have among the highest As concentrations measured in the entire Bengal Basin, reaching values in excess of 4600 μg kg −1. Stable isotope ratios of waters from constructed, perennial ponds indicate the ponds are chiefly recharged during the summer monsoon, and subsequently undergo extensive evaporation during the dry (winter) season. In contrast, groundwaters with high As concentrations plot along the local meteoric water line (LMWL) near where the annual, volume-weighted mean precipitation values for δ 2H and δ 18O would plot. The stable isotope data demonstrate that groundwaters are directly recharged by local precipitation without significant evaporation, and thus are not recharged by, nor mixed with, the pond waters.

Furthermore, reactive transport modeling indicates that dissolved organic matter (DOM) derived from pond waters does not fuel microbial respiration and As mobilization at depth in the underlying aquifer because travel times for pond-derived DOM exceed groundwater ages by thousands of years. Instead, organic matter within the aquifer sediments must drive dissimilatory iron reduction and As release to groundwaters. Auxiliary material for this article contains additional description of methods of sample collection, sample analysis, statistical analysis, and the reactive transport model used to simulate dissolved organic matter (DOM) transport in groundwaters from the Murshidabad district of West Bengal, India. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label.

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Filename Description plain text document, 4K readme.txt Word document, 1865K Text S1. All materials in combined form. Plain text document, 4K Table S1. Stable isotope values (delta-18 O and delta-3 H) for groundwaters and surfaces waters from Murshidabad, West Bengal, India. Image/pjpeg, 136K Figure S1. Does Papa Johns Drug Test Delivery Drivers.