Impacts of channel morphology on residues and ecological risks of polychlorinated biphenyls in water and sediment in Chahe River

被引：5
作者：
Zhao, Zhen-hua [1 ,2 ,3 ]
Sun, Jie [2 ,3 ]
Fang, Xiao-kun [2 ,3 ]
Xia, Li-ling [4 ]
Hussain, Javid [2 ,3 ]
机构：
[1] Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA
[2] Hohai Univ, Minist Educ, Key Lab Integrated Regulat & Resource Dev Shallow, Nanjing 210098, Jiangsu, Peoples R China
[3] Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China
[4] Nanjing Inst Ind Technol, Nanjing 210016, Jiangsu, Peoples R China
来源：
WATER SCIENCE AND ENGINEERING | 2016年 / 9卷 / 04期
基金：
中国国家自然科学基金;
关键词：
PCBs; Channel morphology; RDA; Ecological risk; Toxic equivalent concentration;
D O I：
10.1016/j.wse.2017.01.006
中图分类号：
TV21 [水资源调查与水利规划];
学科分类号：
081501 ;
摘要：
The impacts of channel morphology on the residues and ecological risks of 14 polychlorinated biphenyl (PCB) congeners in water and sediment were investigated in summer (July) and autumn (September) in the Chahe River, in Nanjing, China. The residual concentrations of trichlorobiphenyls (tri-CBs, PCB 18) and tetra-CBs (PCB 52) in water were significantly higher than those of penta-CBsto deca-CBs, and the average residual concentration of PPCBs (sum of 14 PCB congeners) in summer was about six times higher than in autumn. However, the residues in sediment did not change significantly. Redundancy analysis (RDA) indicated that channel morphology and the corresponding environmental indices had significant impacts on PCB residues and their composition profiles in water and sediment. The overflow weir and lake-type watercourse may remarkably reduce the residual concentration and ecological risks of PCBs in water. The highest reduction percentages of the residual concentration and ecological risks of PPCBs induced by an overflow weir were 78% and 67%, respectively, and those induced by a lake-type watercourse were 36% and 70%, respectively. The watercourses with different channel morphologies were ranked by residual PPCBs concentrations in the following descending order: the natural ecological watercourse, vertical concrete watercourse, and vegetation-type riprap watercourse. However, they were ranked by residual PPCBs concentrations in sediment in the following descending order: the vertical concrete watercourse, vegetation-type riprap watercourse, and natural ecological watercourse. (C) 2016 Hohai University. Production and hosting by Elsevier B. V.
引用
收藏
页码：300 / 311
页数：12
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