Influence of traditional agricultural practices on mobilization of arsenic from sediments to groundwater in Bengal delta

Water Research
S H FarooqD Stüben

Abstract

In the wake of the idea that surface derived dissolved organic carbon (DOC) plays an important role in the mobilization of arsenic (As) from sediments to groundwater and may provide a vital tool in understanding the mechanism of As contamination (mobilization/fixation) in Bengal delta; a study has been carried out. Agricultural fields that mainly cultivate rice (paddy fields) leave significantly large quantities of organic matter/organic carbon on the surface of Bengal delta which during monsoon starts decomposing and produces DOC. The DOC thus produced percolates down with rain water and mobilizes As from the sediments. Investigations on sediment samples collected from a paddy field clearly indicate that As coming on to the surface along with the irrigation water accumulates itself in the top few meters of sediment profile. The column experiments carried out on a 9 m deep sediment profile demonstrates that DOC has a strong potential to mobilize As from the paddy fields and the water recharging the aquifer through such agricultural fields contain As well above the WHO limit thus contaminating the shallow groundwater. Experiment also demonstrates that decay of organic matter induces reducing condition in the sediments. Progressi...Continue Reading

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Citations

Nov 1, 2017·Geochemical Transactions·John C AyersSteven Goodbred
Jul 7, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jurng-Jae YeeMeng-Wei Wan
Jun 21, 2020·Environmental Science and Pollution Research International·Xiaoxue OuyangYongtao Li
Jan 9, 2021·Journal of Hazardous Materials·Amos Musyoki MawiaPeisong Hu
Jun 1, 2021·Geochimica Et Cosmochimica Acta·Anand KumarAlexander van Geen
Jul 2, 2021·Water Research·Youssef-Amine BoussougaAndrea I Schäfer

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