Biotite and organic matter in controlling As release in groundwater
Ashraf Seddique
Broschiertes Buch

Biotite and organic matter in controlling As release in groundwater

Focusing on primary source and formation mechanism of arsenic

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Preveously hypothesized that microbial reductive dissolution of As-containing Fe(III) oxyhydroxide (FeOOH) responsible for releasing of As in the Bengal Delta Plain (BDP) aquifers. But FeOOH is a secondary phase formed via chemical weathering of basic minerals. No one observed groundwater As concentration in shallow (i.e.10 m depth)aquifer sediments. At that depth, reduction of FeOOH is expected to occur, since the greatest biogeochemical activity occurs there. Note that the dissolved As concentration is low at those depths. The As contaminated groundwater appears to be at a maximum deeper (i....