South Asia's well-water is widely polluted with arsenic, but no one has located the source. A study on the Mekong River finds that contamination begins in pond sediments, and is spread by groundwater flow to wells.
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Spatial and temporal evolutions of groundwater arsenic approximately along the flow path in the Hetao basin, Inner Mongolia
Chinese Science Bulletin Open Access 02 April 2013
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References
Polizzotto, M. L., Kocar, B. D., Benner, S. G., Sampson, M. & Fendorf, S. Nature 454, 505–508 (2008).
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Gelhar, L. W. Stochastic Subsurface Hydrology (Prentice Hall, 1993).
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Harvey, C. Poisoned waters traced to source. Nature 454, 415–416 (2008). https://doi.org/10.1038/454415a
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DOI: https://doi.org/10.1038/454415a
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