农业环境科学学报2011，Vol.30Issue(12)：2560-2570,11.
渤海湾各形态重金属的地球化学特征及其环境意义
Geochemical Characteristics of Heavy Metals in Different Fraction and Their Environmental Significance in Bohai Bay Sediment Cores, China
摘要
Abstract
The geochemical characteristics of eight heavy metals( Cd, Co, Cr, Cu, Ni, Pb, V and Zn) in two sediment cores from Bohai bay, North China, were studied. The samples were collected in 2008. A sequential extraction procedure was used to gain their fractionation information. Five operationally defined fractions were obtained by this protocol, I.e. Exchangeable (L1), bound to carbonates (L2), bound to Fe/Mn-oxides (L3), bound to organic matter and sulphides(L4), and residual fraction(R5). According to sedimentary data and vertical distribution of heavy metal in the core from the relatively nearshore site, there were several breaks which could be corresponding to the following: the lowest concentration level which occurred in 1939 could be ascribed to the flood of Haihe basin; another flood event in 1963 might be the reason for the other concentration decline in the layer of 10~12 cm depth; the contents of heavy metals kept increasing after 1963. The relative metal concentrations in different fractions took on the order of R5>L3>L2>L4>L1. The heavy metals in extractable fractions were rich near the estuary of Haihe River. The order of enrichment factors(Efs) for studied heavy metals was Pb>Cd>Zn>Cr>V>Co>Cu>Ni. Although the Efs for Pb, Cd and Zn above 1 suggested that they could be polluted by exterior input, but the whole ecological risk of Bohai Bay was low and indicated that the sediment quality was relatively good in general. The ratios of heavy metals in total extractable and residual fractions showed that V and Cr were clean, while Zn, Co, Cu, Ni and Pb were polluted in different levels at different cores, among which Pb was the most polluted one.关键词
重金属/形态/地球化学特征/环境意义/沉积物/渤海湾Key words
heavy metals/ fraction/ geochemical characteristics/ environmental significance/ sediment/ Bohai bay分类
资源环境引用本文复制引用
徐亚岩,宋金明,李学刚,袁华茂,李宁,柏育材..渤海湾各形态重金属的地球化学特征及其环境意义[J].农业环境科学学报,2011,30(12):2560-2570,11.基金项目
国家重点基础研究发展项目(2007CB407305) （2007CB407305）
中央级公益性科研院所基本科研业务费专项(2011T07) （2011T07）
