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| Speciation Distribution and Ecological Risk Evaluation of Cadmium and Lead in Sediments of Longjiang River in Post-Pollution Period |
| Received:September 23, 2017 Revised:October 07, 2017 |
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| DOI：10.3969/j.issn.1007-7545.2018.03.017 |
| KeyWord:Longjiang River; sediment; cadmium pollution; speciation distribution; ecological risk evaluation |
| Author | Institution |
| WEI Yan-song |
河池学院化学与生物工程学院 |
| XIONG Chun-you |
河池学院化学与生物工程学院 |
| HE Chang-hong |
河池学院化学与生物工程学院 |
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| Abstract: |
| The sediments of four sections of Longjiang River (Lalang, Huaiyuan, Yizhou and Huchang) were analyzed to conform speciation distribution and ecological risk of Cd and Pb in sediments in post-polluted period of cadmium pollution incident of Longjiang River. Tessier sequential extraction procedure was applied to test speciation and content of Cd and Pb. Geo-accumulation Index and Hakanson Potential Ecological Risk Index were used to evaluate pollution levels and risk levels. The results show that Cd and Pb mainly exist in forms of hydroxide, carbonate and sulfide. The content of hydroxide and carbonate are evenly distributed, sulfide and total concentration decrease along the river. The geo-accumulation index of Cd in river reach of Lalang and Huaiyuan is level-three, showing a moderate pollution. The pollution level drops sharply compared to levels-six showing an extreme pollution in March and July of 2012. The pollution level of Yizhou and Huchang river reach is level-two, showing a partial pollution. The potential ecological risk level of Cd in sediment of Lalang is heavy, while that of Huaiyuan, Yizhou and Huchang is at medium stage. For Pb in the sediment, the four sections are under a low-pollution state with low risk. |
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