华东地质2025，Vol.46Issue(4)：529-539,11.DOI:10.16788/j.hddz.32-1865/P.2025.05.004
40年来乐清湾潮间带沉积物重金属污染变化及生态风险评价
Changes in heavy metal pollution and ecological risk assessment of intertidal sediments in Yueqing Bay over the past 40 years
摘要
Abstract
Heavy metal elements in the sediments of the intertidal zone are prone to posing threats to the ecosystem through the transmission and accumulation in the food chain.Studying the variations holds significant importance for the security of the ecological environment.To explore the pollution levels and potential ecological and environmental impacts of typical heavy metals in the surface sediments of the intertidal zone of Yueqing Bay over the past 40 years,this study collected and analyzed the data of sediment samples from 1982,2007 and 2021.By adpoting single factor index and Hakanson ecological risk index,we analyzed the content of seven heavy met-als,i.e.Hg,Cd,As,Pb,Cu,Cr and Zn.The results indicated that①the contents of heavy metals in the surface sediments of Yueqing Bay generally exhibited a changing trend of"first increasing and then decreasing"dur-ing the period from 1982 to 2021.②Judging from the single factor pollutant pollution index Cf,Cu has always been severely polluted,Cr,Pb and Zn have been moderately polluted.Cd changed from moderately polluted to severely polluted in 2007,while Hg and As underwent a transformation from low to moderate and then back to low pollution.③The geological accumulation index revealed that there has been no pollution of As and Hg throughout.The sediments at most locations might have been contaminated by Cu,Cd,Cr,Pb,and Zn from 1982 to 2007.After 2007,there was no pollution of Cr and Pb.④The potential ecological risk index of individual pol-lutants demonstrated that As,Cr,Cu,Pb and Zn were all at low ecological risk from 1982 to 2021.The Cd ele-ment was at moderate ecological risk in 1982 and at relatively severe ecological risk in 2007 and 2021.The Hg el-ement was at low ecological risk in 1982 and 2021 and at moderate ecological risk in 2007.⑤In terms of the po-tential ecological risk index RI,over 90%of the stations were at moderate potential ecological risk in 2007 and 2021,and some stations shifted from moderate-severe potential ecological risk to mild-moderate potential ecologi-cal risk in 2021.Generally speaking,the ecological environment of the intertidal zone of Yueqing Bay has im-proved significantly in the past 20 years.However,it is still necessary to pay attention to the pollution conditions of Cu and Cd.关键词
乐清湾/潮间带/环境质量/重金属污染评价/生态风险Key words
Yueqing Bay/intertidal zone/environmental quality/heavy metal pollution assessment/ecologi-cal risk分类
海洋科学引用本文复制引用
XUE Chengfeng,CHEN Yining,XIA Xiaoming,ZHANG Cai,LIU Yifei,WANG Xinkai,CAI Tinglu..40年来乐清湾潮间带沉积物重金属污染变化及生态风险评价[J].华东地质,2025,46(4):529-539,11.基金项目
自然资源部第二海洋研究所中央级公益性科研院所基本科研业务费专项资金项目"浙江省典型淤涨型泥质光滩沉积物有机碳来源及埋藏速率(编号:JG2412)"和科技基础资源调查专项"《中国海岛志》浙江卷第四册编纂(编号:2019FY202105)"联合资助. （编号:JG2412）
