Pyritization of trace metals in estuarine sediments and the controlling factors: a case in Jiaojiang Estuary of Zhejiang Province,China |
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Authors: | Siyuan Ye Edward A Laws Qiang Wu Shaojun Zhong Xigui Ding Guangming Zhao Shaojun Gong |
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Institution: | (1) Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, 62 Fuzhou Road, Qingdao, P.O. Box 266071, People’s Republic of China;(2) Qingdao Institute of Marine Geology, 62 Fuzhou Road, Qingdao, P.O. Box 266071, People’s Republic of China;(3) Louisiana State University, Baton Rouge, LA 70803-4110, USA;(4) China University of Mining and Technology, Beijing, People’s Republic of China |
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Abstract: | Three undisturbed sediment samples were collected from the intertidal zone of the Jiaojiang Estuary of Zhejiang Province,
China. The sediments were found to contain remarkably low concentrations of organic carbon (<0.6%) and acid volatile sulfide
(AVS) (<30 μmol g−1). The availability of these two substrates likely constrained sulfate reduction and pyritization of several trace metals,
respectively. This was especially true at one station where AVS concentrations in the upper 20 cm averaged less than 0.05 μmol g−1. Although the depth dependence of the degree of trace metal pyritization was generally consistent with expectations based
on redox conditions, depth profiles of reactive-metal and pyrite-metal concentrations in several cases revealed more complex
behavior and a positive correlation between reactive-metal concentrations and pore water metal concentrations. |
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