环境工程学报2023，Vol.17Issue(12)：3859-3869,11.DOI:10.12030/j.cjee.202309045
长江中游网湖沉积物重金属污染特征与生态风险评价
Pollution characteristics and ecological risk assessment of heavy metals in sediments of the Wanghu Lake from the middle reaches of the Yangtze River
摘要
Abstract
The Wanghu Lake in Hubei Province is located in the middle reaches of the Yangtze River and is connected to the main stream of the Yangtze River.Studying the distribution characteristics and ecological risk assessment of heavy metals in sediments is of great significance to water quality safety and water pollution control in the Yangtze River Economic Belt.In this paper,the content and spatial distribution characteristics of seven heavy metals such as As,Hg,Cu,Zn,Cd,Pb and Cr in the 0～25 cm sediments from 20 sites of the Wanghu Lake were analyzed.The sources of heavy metals in surface sediments were analyzed by using correlation analysis and principal component analysis.Moreover,this study evaluated the sediment pollution characteristics by using the geo-accumulation index,potential ecological risk index and consensus-based sediment quality guidelines.The results showed that,the average contents of As,Hg,Cu,Zn,Cd,Pb,and Cr were 37.5 mg·kg-1,0.137 mg·kg-1,108 mg·kg-1,123 mg·kg-1,0.283 mg·kg-1,37.8 mg·kg-1,and 108 mg·kg-1,respectively.Compared with other important lakes in the Yangtze River basin,such as the Chaohu Lake and the Taihu Lake,the heavy metal content in the Wanghu lake was at a relatively high level.Pearson Correlation analysis showed that As,Zn and Cd had a significant positive correlation(p＜0.01),indicating that they were homologous and mainly derived from agricultural sources.A highly significant positive correlation(p＜0.01)was also observed between Cu and Pb,and they were mainly discharged from transportation pollution sources.The evaluation results showed that the Wanghu sediment was seriously polluted by heavy metals and had a strong potential ecological hazard,which is relatively serious near the afflux area and needs timely prevention and control.The consensus-based sediment quality guidelines evaluation showed that Zn,Cd,Hg,and Pb had less than 25％probability of causing biological toxicity.As,Cu,and Cr had 25％to 75％probability of causing harmful biological effects.关键词
网湖/沉积物/重金属/污染评价/有害生物效应Key words
the Wanghu Lake/sediment/heavy metals/pollution evaluation/toxicity and harmful biological effects分类
资源环境引用本文复制引用
荣楠,郭灿斌,王文静,周道坤,刘晓伟,卢文洲..长江中游网湖沉积物重金属污染特征与生态风险评价[J].环境工程学报,2023,17(12):3859-3869,11.基金项目
中央级公益性科研院所基本科研业务专项(PM-zx703-202305-268,PM-zx703-202002-025) （PM-zx703-202305-268,PM-zx703-202002-025）
国家自然科学基金资助项目(21707040) （21707040）
