Liu En-Feng, Shen Ji, Yang Li-Yuan, Zhu Yu-Xin, Sun Qing-Yi, Wang Jian-Jun
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2007 Jun;28(6):1377-83.
Chemical forms of Cr, Cu, Mn, Ni, Pb and Zn in the surface sediments of Nansihu Lake and its main inflow rivers are determined by the BCR sequential extraction method. The chemical fractionation composition characteristics, pollution state and potential ecological effects of the heavy metals are discussed. Cr, Cu, Ni and Zn in the sediments of Sihe River, Jinghang Canal, Zhuzhaoxin River, Guangfu River, south area of the Upper Lakes, and Down Lakes mainly exist in residual fraction, which account for 80% - 90% of their content, mainly reflecting the natural characteristics of the heavy metals; but for the sediment of Old Canal, Guangfu River estuary, Baima River, nearly 80% of Cr, Cu, Ni and Zn exist in extractable fractions due to human pollution, especially with high oxidizable and acid extractable fractions content. Pb and Mn mainly exist in residual fraction and oxidizable fraction in the sediment of Nansihu Lake and its main inflow rivers, which account for 95% and 70% of the content of Pb and Mn, similar to other unpolluted sediments. With the mineralization and decomposition of organic matter and change of environment condition of the surface sediment, the extractable fractions of Cr, Cu, Ni, Zn in the polluted sediment can be reactivated, bringing on ecological harm to the water ecological system.
采用BCR连续提取法测定了南四湖及其主要入湖河流表层沉积物中Cr、Cu、Mn、Ni、Pb和Zn的化学形态。探讨了重金属的化学形态组成特征、污染状况及潜在生态效应。泗河、京杭运河、洙赵新河、光府河、上湖南区和下湖沉积物中的Cr、Cu、Ni和Zn主要以残渣态存在，占其含量的80% - 90%，主要反映了重金属的自然特征；而老运河、光府河河口、白马河沉积物中，由于人为污染，近80%的Cr、Cu、Ni和Zn存在于可提取态中，尤其是可氧化态和酸可提取态含量较高。南四湖及其主要入湖河流沉积物中Pb和Mn主要以残渣态和可氧化态存在，分别占Pb和Mn含量的95%和70%，与其他未受污染沉积物情况类似。随着表层沉积物中有机质的矿化分解以及环境条件的变化，污染沉积物中Cr、Cu、Ni、Zn的可提取态会被重新活化，对水生态系统造成生态危害。
