环境化学
碳酸盐
沉积物
生物群
河口
环境科学
萃取(化学)
流域
遗传算法
水生生态系统
污染
重金属
砷
锰
微量金属
化学
Mercury(编程语言)
锌
水文学(农业)
电感耦合等离子体质谱法
生物累积
污染
富集因子
构造盆地
生态学
地质学
海洋学
生物
有机化学
古生物学
色谱法
作者
Sanjay Kumar Sundaray,Binod Bihari Nayak,Saulwood Lin,Dinabandhu Bhatta
标识
DOI:10.1016/j.jhazmat.2010.12.081
摘要
Sequential extraction technique was used to study the mobility and dynamics of operationally determined chemical forms of heavy metals in the sediments and their ecological risk on the biotic species. The results reveal that high environmental risk of Cd, Ni, Co and Pb, are due to their higher availability in the exchangeable fraction. Substantial amount of Cd, Co, Mn, Cu, Zn, Ni and Pb, is observed as carbonate bound, which may result due to their special affinity towards carbonate and their co-precipitation with its minerals. Colloids of Fe-Mn oxides act as efficient scavengers for the heavy metals like Zn, Pb, Cu, Cr, Co, and Ni. Toxic metals like Ni, Pb and Cd are of concern, which occasionally may be associated with adverse biological effects based on the comparison with sediment quality guidelines (SQGs). The risk assessment code (RAC) suggests that the highest mobility of Cd poses a higher environmental risk and also threat to the aquatic biota. Factor analysis reveals that the enrichment of heavy metals in bioavailable fraction is mostly contributed from anthropogenic sources. These contributing sources are highlighted by cluster analysis.
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