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| Characteristics and magnetic diagnosis of heavy metals in deposits by flooding slackwater in the Yaojiang River Valley, Zhejiang Province, China |
| Received:October 10, 2015 |
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| KeyWord:heavy metal;magnetic parameters;flood;slack water deposits;Yaojiang River |
| Author Name | Affiliation | E-mail | | ZHENG Jie | School of Geographic Sciences, East China Normal University, Shanghai 200241 | | | DAI Xue-rong | School of Geographic Sciences, East China Normal University, Shanghai 200241 | xrdai@geo.ecnu.edu.cn | | SHI Yu-xin | School of Geographic Sciences, East China Normal University, Shanghai 200241 | | | WU Zi-yang | School of Geographic Sciences, East China Normal University, Shanghai 200241 | | | XI Ya-juan | School of Geographic Sciences, East China Normal University, Shanghai 200241 | |
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| Abstract: |
| Floodwater often leaves lots of soil in the lower area when it recedes. It is of significance to reveal the content, spatial distribution of heavy metals in the flood slack water deposits(SWD).Twenty-four deposits by an extra-ordinary floodwater were collected from the upper to the lower reach of the Yaojiang River in Yuyao city, Zhejiang province. The feasibility of magnetic diagnosis for heavy metal pollution was explored. Results indicated that the average content of Cu, Zn, Cr, Cd, Pb, Ni, Mn, and Fe in the SWD was 175.23, 400.74, 145.32, 0.83, 43.71, 32.12, 564.35 mg·kg-1 and 4.37%, respectively, all higher than the local background values(Fe not considered pollutant here). Copper was the most serious pollutant with 10.88 times the background value, followed by Cd and Zn, which were 6.75 and 6.32 times the background values, respectively. In spatial distribution, heavy metals displayed increasing trend from the upper to the lower reach, with the highest values occurring in the tributaries flowing through the urban areas, implying industrial impact. The spatial distribution of heavy metals was also reflected in magnetic properties of the deposits. Frequency-dependent magnetic susceptibility(χfd) and S-100mT displayed significant positive correlations with content of Cu, Zn, Cr, Cd, Ni and Pb. It suggested that magnetic parameters might be used as an indicator of heavy metal pollution in flood SWD. However, due to the complicated hydrodynamic environment and pollutant transfer during flood events, it is necessary to further study the use of magnetic properties as quantitative indicators of heavy metal pollution. |
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