摘要
分析了辽宁省蛤蜊岛附近海域海水和表层沉积物中的Fe、Mn、Cu、Pb、Zn和Cr分布特征,利用相关性分析和主成分分析探讨了重金属的来源,采用地累积指数和富集因子法评价了其污染现状。结果表明,海水中重金属的含量均满足第二类水质标准;沉积物中Cu、Pb和Zn的含量符合海洋沉积物质量标准的一类沉积物标准,Cr的含量介于一类和二类标准之间。与中国海域重金属的背景值相比,蛤蜊岛附近表层沉积物中除了Cu的平均含量大小相似外,其他重金属的平均含量均较高。重金属总量在蛤蜊岛连接陆地的大坝附近富集明显,尤其是Mn,达到远海采样点的3倍多。相关性分析和主成分分析的结果表明重金属的来源可能是受人为影响较小的陆源碎屑。评价结果显示,Fe、Mn、Cu和Zn基本处于无污染(富集)的状态,Pb处于无污染至中等污染(富集)的状态。
The distributions of Fe,Mn,Cu,Pb,Zn and Cr in the seawater and sediments collected from the sea area close to the Geli Island in Liaoning province were analyzed.The origin of heavy metals was discussed according to the correlation analysis and principal component analysis,and the pollution levels were evaluated on the basis of the geo-accumulation index(Igeo)and enrichment factor(EF).The results showed that the contents of Cu,Pb,Zn and Cr are within the class II standard in the seawater,the contents of Cu,Pb and Zn are within the class I standard and Cr are between the class I and class II standards in the sediment.Average concentrations of the metal elements,except Cu,exceed their corresponding background values in China seas.All the heavy metals tend to accumulate in the vicinity of a dam,and especially the concentration of Mn at the dam site is three times higher than at the pelagic sites.These heavy metals are probably derived from the terrestrial detritus,which are almost free from the anthropogenic pollution.The results of pollution assessment show that Fe,Mn,Cu and Zn are generally unpolluted status,and Pb is unpolluted to moderate polluted status.
作者
李亚琳
姜欣
汪天祥
朱林
LI Yalin;JIANG Xin;WANG Tianxiang;ZHU Lin(Jiangxi Provincial Institute of Water Sciences,Nanchang Jiangxi,330000;School of Hydraulic Engineering,Dalian University of Technology,Dalian Liaoning,116024;China Water Resources Pearl River Planning Surveying&Designing CO.,LTD,Guangzhou Guangdong,510610)
出处
《海洋湖沼通报》
CSCD
北大核心
2019年第6期98-105,共8页
Transactions of Oceanology and Limnology
基金
国家自然科学基金青年基金(51809032)资助.
关键词
河口
沉积物
重金属
富集
污染评价
estuary
sediment
heavy metal
enrichment
pollution assessment
