| Autor: |
Guangyuan Wang, Xingyu Liu, Qiyuan Gu, Mingjiang Zhang, Jiankang Wen, Xiaosheng Zhang, Yaosi Huang, Fuke Huang |
| Předmět: |
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| Zdroj: |
Desalination & Water Treatment; Jan2017, Vol. 62, p298-306, 9p |
| Abstrakt: |
The distribution of chemical speciation of selected elements (arsenic, iron, lead, stibium and zinc) in the stream sediments of Longjiang River (China) was studied after an environmental accident of cadmium spill. Forty samples from stream sediments of different locations of Longjiang River were selected. Sequential extraction procedures were carried out to determine the chemical forms of metals, showing that a large amount of Cd from the cadmium spill was precipitated in sediments and removed by chemical precipitation. The amount of Cd in sediments had reached an alarming level. The metals of As, Pb and Zn in the sediments might be partially converted into mobilized forms with the condition change, which should be monitored regularly. To better understand the toxicity of these pollutants and evaluate the ecological risks, principal component analysis (PCA) and Geoaccumulation Index (Igeo) were applied to assess the contamination levels of heavy metals in sediments. The results provide a better image in defining the contamination extent of heavy metals in sediments. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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