摘要
为了评价重金属铅(Pb)、锌(Zn)和镉(Cd)复合污染土壤的生态风险,以桂林市阳朔县兴坪镇思的村铅锌矿污染区作为研究区域,采集(Ⅰ、Ⅱ和Ⅲ区)40个土壤样品进行Pb、Zn和Cd分析测试。从文献中采集Pb、Zn和Cd对不同陆生生物的毒性数据,建立每个重金属的物种敏感度分布曲线(SSD),确定不同重金属对物种的5%有害浓度(HC_(5))作为预测无效应浓度(PNEC),计算出单一重金属及其混合物的风险熵值(RQ)。结果表明:经SSD估计的Pb、Zn和Cd的HC_(5)分别为193.19、308和9.49 mg/kg;除Ⅱ区重金属Zn含量(平均值)外,其余检出含量(平均值)均超出GB15618—2018《土壤环境质量农用地土壤污染风险管控标准(试行)》的风险筛选值;生态风险评价结果表明:Ⅰ和Ⅲ区的RQ_(mix)(平均值)明显大于Ⅱ区,Pb、Zn和Cd复合污染的高风险样品和中风险样品分别占总样品的62.50%和37.50%;无低风险和无风险样品,其中Zn是主要风险因子,其次为Pb。
In order to evaluate the ecological risk of combined pollution soil of heavy metals lead(Pb),Zinc(Zn),and cadmium(Cd).A total of 40 soil samples(Ⅰ,ⅡandⅢ)were collected and determined the contents of Pb,Zn,and Cd in the study area of lead-zinc contaminated soil of Si Village,Xingping Town,Yangshuo County,Guilin.The toxicity data of Pb,Zn and Cd to different terrestrial organisms were collected from the literature,and the species sensitivity distribution curve(SSD)of each heavy metal was established.The 5%hazardous concentrations(HC_(5))of different heavy metals to the species was determined as the predicted no effect concentration(PNEC).The risk quotient(RQ)of single heavy metal and its mixtures was calculated.The results showed that the estimated HC_(5)values of Pb,Zn,and Cd calculated from SSD were 193.19,308.00,and 9.49 mg/kg,respectively.Except for the content of heavy metal Zn in ZoneⅡ(average value),the other detected content(average value)exceeded the risk screening value of‘soil environmental quality-risk control standard for soil contamination of agricultural land’(GB 15618—2018).The ecological risk assessment results showed that the RQ_(mix)(average value)ofⅠandⅢzones was significantly higher than that ofⅡzone.The high risk and medium risk Pb,Zn and Cd combined samples accounted for 62.5%and 37.5%of the total sample,respectively.There were no low risk and no risk samples,in which Zn was the main risk factor,followed by Pb.There were 25 samples with high risk of Pb,Zn and Cd combined pollution,accounting for 62.5%of the total samples.There were 15 medium risk samples,accounting 37.5%of the total samples.There were no low risk and no risk samples,in which Zn was the main risk factor,followed by Pb.
作者
黄小霞
刘洁雪
黄娥
陈燕玲
莫凌云
梁延鹏
曾鸿鹄
邓振贵
覃礼堂
Huang Xiaoxia;Liu Jiexue;Huang E;Chen Yanling;Mo Lingyun;Liang Yanpeng;Zeng Honghu;Deng Zhengui;Qin Litang(College of Environment Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China;Technical Innovation Center of Mine Geological Environmental Restoration Enginneering in Southern Karst Area,Nanning 530022,China;Hengsheng Water Environment Treatment Co.,Ltd,Guilin 541199,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第S02期787-793,共7页
Environmental Engineering
基金
国家重点研发计划(2019YFC0507504)
广西科技重大专项(桂科AA2016100403,桂科AA20161001)
关键词
SSD
风险熵
重金属
生态风险
土壤
SSD
risk quotient
heavy metals
ecological risk
soil
