摘要
为了解广东阳江近岸海域表层海水重金属含量及潜在生态风险,采集了 14个站位的表层海水样,分析讨论了该海域表层海水中7种重金属Cr、Cu、Zn、Cd、Pb、As、Hg的含量分布特征,采用Hakan-son潜在生态危害指数法评价其生态风险.结果表明:广东阳江近岸海域表层海水重金属Cr、Cu、Zn、Cd、Pb、As、Hg 的平均浓度分别为 1.10、5.25、9.91、0.027、0.945、1.06、0.027 μg/L.其中 Cr、Zn、Cd、Pb、As、Hg六种元素符合一类海水水质标准,Cu符合二类海水水质标准;7种重金属间相关性较强,各重金属与不同环境参数也存在一定的相关性.对潜在生态风险指数进行分析,计算出RI平均值为6.59,属于轻微生态危害,总体为清洁水平.
Abstract
To understand Yangjiang,Guangdong nearshore sea surface water content and potential eco-logical risk of heavy metals,samples surface waters were collected at 14 stations.The content distribu-tion characteristics of 7 kinds of heavy metals were analyzed in surface waters including Cr,Cu,Zn,Cd,Pb,As,and Hg.The Hakanson method was adopted to evaluate their ecological risk index and potential ecological harm.The results showed that the average concentrations of heavy metals Cr,Cu,Zn,Cd,Pb,As and Hg in the surface waters off Yangjiang were 1.10 μg/L,5.25 μg/L,9.91 μg/L,0.027 μg/L,0.945 μg/L,1.06 μg/L and 0.027 μg/L,respectively.Among them,Cr,Zn,Cd,Pb,As and Hg met the quality standards for class Ⅰ seawater,while Cu met the quality standards for class Ⅱ seawater.There was a strong correlation among the 7 heavy metals,and each heavy metal also had a certain correlation with different environmental parameters.Based on the analysis of the potential eco-logical risk index,the average value of RI was calculated to be 6.59,which was a slight ecological haz-ard and the overall level of cleanliness.
基金项目
国家重点研发计划资助(2021YFC2902003)
中国地质调查局(1212010914020)
NETL
NSTL
万方数据