农业环境科学学报2017，Vol.36Issue(6)：1192-1201,10.DOI:10.11654/jaes.2016-1529
开封城郊河道底泥重金属形态垂向分布特征及风险评价
Vertical distribution characteristics and risk assessment of heavy metals in core sediments from Kaifeng sub-urban rivers
摘要
Abstract
To understand the migration characteristics and ecological risk problems of heavy metals in sediments of Kaifeng suburban rivers, vertical sediments from three rivers were collected and analyzed for total concentrations and speciation of heavy metals by using the sequen-tial extraction procedure, and risks from exposure to heavy metals in sediments were evaluated using the risk assessment code method. The results indicated that the mean contents of Cd, Cu, Zn, and Pb were higher than the China Stream Sediment Background Values. There were significant differences in vertical distributions of total concentrations and different species concentrations of heavy metals in the sediment cores from six sampling sites, however there was no distribution regularity. Sediment profiles from the lower section of each river showed sig-nificantly higher total concentrations of Cd, Cr, Cu, Ni, Zn, and Pb than those from the upper sectin. Cd and Zn existed mainly in the ex-changeable fraction and residual fraction, whereas Cr, Ni, Cu, and Pb existed mainly in the residual fraction. Based on the results from the RAC method, the risks from exposure to heavy metals in the surface sediments were in the following order:Cd>Zn>Cu>Ni>Cr>Pb. In the vertical sediments, Cd mainly posed high to extremely high risk to the environment, Zn a medium to high risk, Cu and Ni a slight to medium risk, and Cr and Pb slight risk.关键词
开封城郊/底泥剖面/重金属形态/风险评价/资源化利用Key words
Kaifeng suburb/sediment profile/heavy metals speciation/risk assessment/resource utilization分类
资源环境引用本文复制引用
张俊华,卢翠玲,刘玉寒,王洪涛..开封城郊河道底泥重金属形态垂向分布特征及风险评价[J].农业环境科学学报,2017,36(6):1192-1201,10.基金项目
国家自然科学基金(U1404401,41101088) （U1404401,41101088）
河南省高校科技创新团队支持计划项目(161RTSTHN012) The National Natural Science Foundation of China(U1404401,41101088) （161RTSTHN012）
Program for Innovative Research Team(in Science and Technology)in Universities of Henan Province(161RTSTHN012)" （in Science and Technology）
