摘要
为开展大沽河干流沉积物7种重金属(Cu、Pb、Zn、Cr、Cd、Hg和As)含量、赋存形态及生态风险研究,于2018年11月和2019年7月对大沽河河流沉积物进行采样、测定及分析,结果表明,Hg潜在生态风险程度最高为极高风险,而Cd、As、Cu、Pb、Cr和Zn为低风险;Cr、As和Hg可能对底栖生物产生危害,而Cu、Pb、Zn和Cd对底栖生物不产生危害;Pb和Cu主要以可提取态存在(占比为63.53%和54.95%),而As、Cr、Hg、Zn和Cd以残渣态为主(占比为78.28%、70.49%、66.27%、57.01%和53.67%),夏季Hg和Cr的可提取态占比显著高于秋季;主成分分析显示,沉积物重金属Hg可能来源于大沽河上游金属矿采选冶炼污染源,Cu、Zn和Cr可能来源于畜禽养殖及农业面源污染。
This study aimed to gain a clear understandingon the status of the heavy metal content,occurrence characteristic and ecological risk of the Dagu River.Total and fractions of seven heavy metals(Cu,Pb,Zn,Cr,Cd,Hg and As)were studied in November 2018and July 2019.The results indicated that Hg was the primary heavy metal with a highest ecological risk whereas the potential ecological risk indexs for the other six heavy metals in the River were relatively low.Cr,As,and Hg may cause harm to the benthic organisms,while Cu,Pb,Zn And Cd do not.Pb and Cu mainly existed in extractable fraction(63.53%and 54.95%),while As,Cr,Hg,Zn,and Cd mainly existed in the residue fraction(78.28%,70.49%,66.27%,57.01%and 53.67%).The percentage of extractable fraction of Hg and Cr in summer was significantly higher than that in autumn.The principal component analysis indicated that Hg was mainly derived from mine drainage and metal smelting in the upstream of the Dagu River.Cu,Zn and Cr were mainly derived from livestock and agricultural non-point source pollution.
作者
孙鸿运
胡泓
高培
陈刚
焦捷
杨泽川
SUN Hongyun;HU Hong;GAO Pei;CHEN Gang;JIAO Jie;YANG Zechuan(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Marine Life Sciences College,Ocean University of China,Qingdao 266003,China;Shandong Academy of Environmental Sciences CO.LTD.Jinan 250014,China)
出处
《海洋湖沼通报》
CSCD
北大核心
2020年第5期95-104,共10页
Transactions of Oceanology and Limnology
基金
国家水污染治理与控制重大专项课题“流域水生态功能分区管理技术集成”(2017ZX07301-001)资助。
关键词
河流沉积物
重金属形态
生态风险评价
sediment
occurrence forms of heavy metals
risk assessment
