WANG Jie1,2, XU Li-ying1, WANG Xin1, JIA Yong-feng1
1. Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: The goal of this study is to find out the fate of arsenic in reductive environments like sediment environment where the fate of arsenic is strongly influenced by microbial activities. A clean sediment loaded with arsenic was use in this experiment to simulate the transformation of arsenic under activities of microbial in the reductive environment. The concentration fluctuation of aqueous arsenic, P-extraction arsenic and the HCl-extraction arsenic were observed. Arsenic, iron oxides and sulfate were reduced strongly. More than 97% arsenic as well as iron oxides were reduced and 26% dissoluble arsenic turned into insoluble forms after 3~7days. Meanwhile the sediment system became more complex with the participation of produced sulfides. Based on evidences, we concluded that the fate of arsenic is strongly impacted by products of Fe and S. The reductions of Fe, As and S were happened simultaneously, S2- controls the environmental behaviors of Fe, the ferric form FeS is the main species of S, and AsS is the main destination of arsenic.
Keywords: sediment arsenic microbial reduction speciation transformation
*Corresponding Author, E-Mail: xuliying@iae.ac.cn
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.2, 2015, page 310-315
