生态环境学报2017，Vol.26Issue(5)：850-856,7.DOI:10.16258/j.cnki.1674-5906.2017.05.017
东平湖表层沉积物重金属形态分布特征及环境风险评价
Speciation Distribution Characteristics and Environmental Risk Assessment of Heavy Metals in Surface Sediment of Dongping Lake
摘要
Abstract
In order to understand the speciation distribution and the ecological environmental risk of heavy metals in the sediment of Dongping Lake, which is the second largest freshwater lake in Shandong Province and serves as the important reservoir in the east route of the South-to-North Water Diversion Project of China, the speciation of Cu, Ni, Pb and Zn in 44 surface sediment samples collected around Dongping Lake was analyzed by using the BCR (European Community Bureau of Reference) sequential extraction procedure. The environmental risk of heavy metals was evaluated by the ratio of secondary phase to primary phase (RSP) and risk assessment code (RAC), both of which are based on the fraction concentrations of heavy metals. The results showed that the Ni, Cu, Pb and Zn existed mainly in residual fraction (65.9%, 56.1%, 49.3% and 39.3%, respectively), and then the Fe-Mn oxide fraction was the dominant for Pb (38.2%), Cu (28.6%) and Ni (17.0%), while Zn was found mainly in the organic and sulfide fraction (34.7%). The weak acid soluble fraction accounted for the lowest percentage with the descending order of Zn (12.2%)>Cu (6.9%)>Pb (4.3%)>Ni (4.1%). The extractable fraction of heavy metals (i.e. the sum of the weak acid soluble fraction, the Fe-Mn oxide fraction and the organic and sulfide fraction) showed significant spatial variations. Both the concentrations and percentages of the extractable fraction of Cu, Ni and Pb were higher around the inflow area of River Dawen, while Zn showed high concentrations and percentages of the extractable fraction around the whole lake except in the lake central area. Different fractions of Cu, Pb and Zn had some correlations between each other. The fraction concentrations of heavy metals generally had positive correlations with the organic matter content, but were weakly correlated with the average particle size. The assessment results showed that Zn was generally at the middle pollution level, which might pose middle environmental risk, while Cu, Ni and Pb were at clean to light pollution level, which environmental risk was low.关键词
重金属/形态分布/表层沉积物/环境风险/东平湖Key words
heavy metal/speciation distribution/surface sediment/environmental risk/Dongping Lake分类
资源环境引用本文复制引用
张菊,陈明文,鲁长娟,郭娜,殷山红,邓焕广..东平湖表层沉积物重金属形态分布特征及环境风险评价[J].生态环境学报,2017,26(5):850-856,7.基金项目
国家自然科学基金项目(41401563) （41401563）
山东省自然科学基金项目(ZR2014JL028 （）
ZR2011DQ015) （）
中国博士后科学基金项目(2015M571830) （2015M571830）
