东营市三个河口区域表层海水重金属的分布与生态风险评价

Distribution and Ecological Risk Assessment of Heavy Metals in Surface Seawater from Three Estuaries in Dongying

2015年8月监测了东营市广利河、神仙沟河、挑河3个河口海水中7种重金属污染物浓度,以二类海水水质标准来看,3个河口的重金属主要污染物为铜和汞。与国内外其它河口的海水重金属污染物浓度相比,东营市河口海域的Hg浓度在国内居于较高水平,其它污染物则处于中等水平。采用风险商(HQs)和联合概率曲线(JPCs)相结合的方法,评价了7种重金属对三个河口海域的生态风险,发现As,Cd,Hg和Pb对3个河口海域的生态风险可接受,Cu,Cr6+和Zn不可接受。其中Cu,Cr6+和Zn对广利河和神仙沟河河口海域的生态风险大小顺序均为Cu>Zn>Cr^(6+),对挑河河口为Cu>Cr^(6+)>Zn,Cu为3个河口海域的主要污染物。本研究为东营市河口区域重金属污染的生态管理提供科学依据。

Seven heavy metals(Hg,As,Pb,Cd,Cr 6+,Cu,Zn)in surface seawater of three estuaries(Guanglihe,Shenxiangouhe,Tiaohe)were monitored in August,2015.The comparison of concentrations in seawater with GradeⅡof Sea Water Quality Standard(GB 3097-1997)showed that Cu and Hg were the main pollutants in the three estuaries.Comparing with other estuaries,the concentrations of Hg in the estuaries of Dongying were the highest and other heavy metals were in the middle level.An assessment of the ecological risks posed by these heavy metals in surface seawater were conducted by combining the hazard quotient(HQs)and joint probability curve(JPCs)methods.The results reveal that the ecological risks posed by As,Cd,Hg,and Pb were at an acceptable level,while Cu,Cr 6+,and Zn were not.The order of ecological risk of Cu,Cr 6+,and Zn was Cu>Zn>Cr 6+to Guanglihe and Shenxiangouhe and Cu>Cr 6+>Zn to Tiaohe.Cu was the main pollutant in the three estuaries.This study provides scientific basis for the ecological management of heavy metal pollution in the estuary of Dongying.