摘要
内海湾底泥沉积物的环境质量状况与水生生物的生存和人体健康关系密切。在广东汕头市内海湾两岸23个点位采集了表层(0~20 cm)和深层(100~120 cm)底泥沉积物样品46件,对其pH值和Cd、Hg、As、Pb、Cr、Cu、Zn计7项重金属及K含量进行测试分析,调查底泥中这些重金属的含量特征,并参照农用地水田土壤污染风险管控标准对重金属环境污染质量进行评价。结果表明汕头内海湾底泥沉积物的pH介于7.00~8.82之间,平均值为7.83,在46件样品中41件样品的pH值大于7.5。内海湾底泥中7项重金属元素的含量均明显低于环境污染风险管制值,即对该区底泥重金属环境污染不需要管制。Cd、As、Pb、Cr这4项重金属含量均低于污染风险筛选值,其污染风险可以忽略。2件表层样品的Hg含量值高于污染风险筛选值,18件样品的Cu和Zn含量值高于污染风险筛选值,因此建议对底泥中Cu、Zn、Hg含量进行环境质量监测。K含量介于0.70%~2.59%,平均值为1.54%。基于表层底泥和深层底泥元素含量对比分析,认为该区Hg污染来源应为人为源;Cu、Zn的污染来源一部分为人为源,另一部分可能为人为源、自然源或二者的混合源。
The environmental quality of sediments in inland bay is closely related to the survival of aquatic organisms and human health.Forty-six samples are collected from surface and deep sediments in 23 locations of cross-gulf in the Inland Bay of Shantou City in Guangdong Province.The pH values,the concentration of 7 heavy metal elements,Cd,Hg,As,Pb,Cr,Cu and Zn,and the content of K are analyzed to evaluate the environmental risk of heavy metals in these sediments with reference to soil contamination risk of paddy field in agricultural land.The results show that the pH of sediments in Shantou Inland Bay is between 7.00 and 8.82,with an average value of 7.83.Among 46 samples,41 samples have pH values greater than 7.5.The contents of 7 heavy metals in the sediments of Inland Bay are obviously lower than their environmental pollution control values,which means there is no need to control the environmental pollution of heavy metals in the sediments.The contents of Cd,As,Pb and Cr are all lower than their screening values of pollution risk,and their pollution risk could be ignored.The concentrations of Hg in 2 surface samples were higher than the screening value of pollution risk,and the contents of Cu and Zn in 18 samples were higher than their screening values of pollution risk.Therefore,it is suggested to monitor the concentrations of Cu,Zn and Hg in these sediments.The content of K is between 0.70%and 2.59%,with an average value of 1.54%.Based on the comparison of elemental contents between surface layer and deep layer sediments it is concluded that the pollution source of Hg in this area should be anthropogenic.However,the pollution sources of Cu and Zn may be anthropogenic or mixed resulted from anthropogenic and natural resources.
作者
李金哲
刘宁强
龚庆杰
李承柱
LI Jinzhe;LIU Ningqiang;GONG Qingjie;LI Chengzhu(Guangzhou Waterway Engineering Design Institute Co.,Ltd,China Communications Construction,Guangzhou,Guangdong510230,China;Industry and Technology Service Center,Shantou High-tech Industry Development Zone,Shantou,Guangdong515041,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China)
出处
《现代地质》
CAS
CSCD
北大核心
2021年第5期1441-1449,共9页
Geoscience
关键词
内海湾
底泥沉积物
重金属
环境评价
来源分析
inland bay
sediment
heavy metals
environmental assessment
source analysis
