Journal
MARINE POLLUTION BULLETIN
Volume 126, Issue -, Pages 293-303Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.11.017
Keywords
Ecological risk assessment; Heavy metals; Sediments; Geochemical speciation; Biomarkers
Funding
- National Natural Science Foundation of China [41240040]
- Shandong Marine Resource and Environment Research Institute
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Surface sediments and clam Meretrix meretrix were collected from a northern estuarine region in Dongying City, China. Sediments were analysed for heavy metals (Hg, As, Cd, Cr, Cu, Pb, and Zn) and the clams were tested for metallothioneins (MTs) and lysosomal membrane stability (LMS). The heavy metal total concentrations decreased in the order of Cr > Zn > Cu > Pb > As > Cd > Hg. The results of Bureau Communautaire de Reference (BCR) sequential extraction of heavy metals showed that the geochemical speciation of all heavy metals was dominated by residual fraction. According to the responses of biomarkers in M. meretrix, the modified potential ecological risk index (PERI-B) can more accurately reflect heavy metals pollution. PERI-B showed all sediment samples have low or moderate risk, except at site S10 (considerable risk), and the main contribution of ecological risk heavy metals were Cd and Hg.
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