Abstract：
:Arsenic (As) is mobilized from delta and floodplain aquifer sediments throughout S.E. Asia via reductive dissolution of As bound to iron (Fe) oxyhydroxides. The reductive driving force is organic carbon, but its source and constitution is uncertain. Here batch incubation experiments were conducted to investigate the role of organic matter (OM) carbon:nitrogen (C:N) ratio on the mobilization of arsenic, Fe and N from As dosed, Fe oxyhydroxide coated sands. As mobilization into pore waters from the sand was strongly regulated by the C:N ratio of the OM, and also the concentration of OM present. The lower the C:N, the more As released. Fe and ammonium release were similarly dependent on the quality and quantity of OM, but Fe mobilization was more rapid and ammonium release slower than As suggesting that the mobilization of these 3 moieties although interdependent, were not directly linked. It was concluded that low C:N ratios for OM responsible for reducing aquifers were As in groundwater is observed were likely.
journal_name
Environ Intjournal_title
Environment internationalauthors
Solaiman AR,Meharg AA,Gault AG,Charnock JMdoi
10.1016/j.envint.2008.07.024subject
Has Abstractpub_date
2009-04-01 00:00:00pages
480-4issue
3eissn
0160-4120issn
1873-6750pii
S0160-4120(08)00137-2journal_volume
35pub_type
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