Speciation and Risk Characteristics of Heavy Metals in the Sediments of the Yangtze Estuary

Based on the investigation on the distribution of total contents and speciation of 8 heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) in the surface sediments at 14 typical sites of the Yangtze Estuary during three hydrological seasons ( wet, normal, and dry seasons) , this study applied equilibrium pa...

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Bibliographic Details
Published inHuanjing kexue Vol. 37; no. 3; p. 917
Main Authors Yin, Su, Feng, Cheng-hong, Li, Yang-yang, Yin, Li-feng, Shen, Zhen-yao
Format Journal Article
LanguageChinese
Published China 15.03.2016
Subjects
China
Environmental Monitoring
Estuaries
Geologic Sediments - chemistry
Hydrology
Metals, Heavy - analysis
Risk Assessment
Rivers
Seasons
Water Pollutants, Chemical - analysis
China
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Summary:Based on the investigation on the distribution of total contents and speciation of 8 heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) in the surface sediments at 14 typical sites of the Yangtze Estuary during three hydrological seasons ( wet, normal, and dry seasons) , this study applied equilibrium partitioning approach to build the sediment quality guidelines (SQGs) of the Yangtze Estuary, and assessed ecological risks of the heavy metals. The relationship between ecological risk and speciation of heavy metals was also revealed. The results showed that, except for Cd, the residual fraction was the main speciation of heavy metals, especially for As, Cr and Hg, their residual fraction proportions were all over 90%. The sediment quality guidelines of the Yangtze Estuary for As, Cd, Cr, Cu, Hg, Ni, Pb, Zn were 43.29, 0.672, 79.65, 19.08, 0.569, 339.09, 30.87, 411.36 µg · g⁻¹, respectively. Cu had the highest ecological risk to aquatic organisms. The upstream of Yangtze Estuary was mainly affected by Yangtze River
ISSN:0250-3301
DOI:10.13227/j.hjkx.2016.03.016