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Gude, J.C.J. (author), Rietveld, L.C. (author), van Halem, D. (author)The top layer of natural rapid sand filtration was found to effectively oxidise arsenite (As(III)) in groundwater treatment. However, the oxidation pathway has not yet been identified. The aim of this study was to investigate whether naturally formed manganese oxide (MnO<sub>2</sub>), present on filter grains, could abiotically be responsible...journal article 2017