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| Fractions and Releases of Mercury and Arsenic in Sediments of Dalinuoer Lake, China |
| Received:June 11, 2014 |
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| KeyWord:Dalinuoer Lake;sediments;mercury;arsenic;fractions;releasing |
| Author Name | Affiliation | E-mail | | LI Yun-fei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | HE Jiang | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | ndjhe@imu.edu.cn | | LÜ Chang-wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | Enhe | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | Dudagula | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | XIE Zhi-lei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | |
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| Abstract: |
| Fractions and releases of a heavy metal in sediments affect its environmental behaviors. In this work, a seven-step sequential extraction method was used to extract mercury(Hg) and arsenic(As) in the surface sediments from Dalinuoer Lake. Also, releasing of Hg and As from the sediments at different pH was examined. The results showed that Hg bioavailability in sediments was primarily fraction bound to humic acid, and that of As was carbonates and Fe-Mn oxides fractions. Releases of Hg and As from the sediments were little in alkali and weak alkaki solution, but significant in strong alkali solution. Pre-extraction by acid solution resulted in more Hg and As released in alkaline extraction because dissolution of the metal oxides exposed more metals bound to humic acid. Likewise, more Hg and As were extracted in acid solution after the sediments were pre-extracted with alkali solution, due to exposed Fe-Mn oxides from dissolution of the humic acid by alkali solution. Keeping lake water under weak alkaline conditions is the key to health and ecological safety in Dalinuoer Lake. |
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