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Dynamics of arsenic in salt marsh sediments from Dongtan wetland of the Yangtze River estuary,China

Journal of Environmental Sciences 2012年第12期24卷 2113-2121页

作者： Yongjie Wang Limin Zhou Xiangmin Zheng Peng Qian Yonghong Wu Department of Geography College of Resources and Environmental SciencesEast China Normal UniversityShanghai 200062China School of Geography Nantong UniversityNantong 226019China Department of Gography Minfiang UniversityFuzhou 350108China

The mobility and transformation of arsenic （As） in salt marsh sediments were investigated in Dongtan wetland of the Yangtze River estuary, China. As in surface water, pore water and the rhizosphere sediments were quantified. The microcosm incubation experiments were conducted during the flooding of the sediments to examine As dynamics that occurred during changing redox conditions. The concentrations of dissolved As in pore water （0.04--0.95 ixmol/L） were significantly greater than that in surface water （0.03-0.06 lunol/L）. Under anoxic conditions, the reactive As could be initially mobilized by the reductive dissolution of Fe（III）（hydr）oxides. Subsequently, most of the dissolved As was likely to be associated with secondary iron （hydr）oxide phases and remained in solid phases. The seasonal variability of acid volatile sulfide concentrations suggest the anoxic conditions are enhanced during summer by Spartina alterniflora compared to Phragmites australis and Scirpus mariqueter, causing a notable increase in As mobility. Generally, there was a typical variation in redox conditions with season in salt marsh sediments of Dongtan wetland, in which the dynamics of As mobility and transformation possibly were controlled by iron, and all of this could be significantly influenced by the rapid spread of S. alterniflora.

关键词： Arsenic iron （hydr）oxides salt marsh sediment Spartina alterniflora Yangtze River estuary

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