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| Occurrence of heavy metals in surface sediments from estuaries in Bohai bay and their ecological risk assessment. |
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Abstract Heavy metals contamination in sediments affects marine ecosystems adversely. The present study analyzed As, Cd, Cr, Cu, Pb and Zn ions in surface sediments and wildfish collected from estuary of Dashentang, Gaoshaling, Haihe, Ziyahe and Nanpaihe in Bohai bay were analyzed. Of six heavy metals, concentration of Zn was the highest (81.55mg/kg), and that of Cd was the lowest (0.28 ± 0.08 mg/kg), and the same trend was also found in the muscle of wildfish where Zn was the highest (96.75±30.98 mg/kg), and Cd was not detectable. The ecological risk of heavy metals in sediments using potential ecological index (RI) was estimated and the RI decreased in the order of Haihe>Ziyahe>Nanpaihe>Dashentang> Gaoshaling. Moreover, the metallothionein concentrations in wildfish from Ziyahe expect for Haihe were the highest, which was consistent to the RI in sediments.
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Received: 16 October 2009
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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