泉州湾沉积物重金属形态特征及生态风险  

Speciation and Ecological Risk of Heavy Metals in Sediments From Quanzhou Bay

作　　者：于瑞莲[1] 胡恭任[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2008年第3期419-423,共5页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(40673061);福建省自然科学基金资助项目(D0310017);泉州市科技计划项目(2007Z43)

摘　　要：用改进的BCR四步连续提取法,分析泉州湾潮间带表层沉积物中9种重金属的赋存形态.结果表明,Mn主要以弱酸溶态存在,Pb,Cu主要以可还原态存在,而Fe,V,Cr主要以残渣态为主,重金属的迁移性顺序为Mn>Pb>Cu>Co>Zn>Ni>Cr>V>Fe.潜在生态风险指数法评价结果显示,Cu,Ni生态危害程度较高,Zn,Pb生态危害程度较低;Cu,Zn,Ni,Cr,Pb 5种重金属元素的综合潜在生态风险水平较高.The chemical speciation of heavy metals （Cu, Zn, Ni, Cr, Mn, Co, Fe, V, Pb） in surface sediments from Quanzhou Bay were determined using the modified BCR-four step sequential extraction procedure, proposed by the European Community Bureau of Reference （BIER）. The results show that Mn is present the most highest percentage in the acid -soluble fraction and Pb,Cu highest in the reducible fraction, meaning these metals present greater mobility. The highest percentages of Fe,V and Cr were found in the residual fraction, meaning they are less harmful to the environment. The mobility order of the heavy metals studied is Mn〉Pb〉Cu〉Co〉Zn〉Ni〉Cr〉V〉Fe. The assessment on potential ecological risk indices of heavy metals indicates that Cu and Ni show relatively higher ecological hazards while Zn and Pb show relatively lower ecological hazards. The comprehensive potential ecological risk of Cu, Zn, Ni, Cr and Pb presents relatively higher degree.

关 键 词：重金属 赋存形态 潜在生态风险 沉积物 泉州湾 

分 类 号：X825[环境科学与工程—环境工程] X53