摘要
分析了贵阳市白云区某铝厂周边耕地土壤的两个垂直剖面中8种重金属(As、Cd、Cr、Cu、Hg、Ni、Pb和Zn)的垂向分布特征,并采用地累积指数法和潜在生态危害指数法进行风险评价。结果表明:(1)重金属含量随着深度的增加虽然有波动,但还是表现出递减的趋势,并逐渐趋近于或低于贵阳市土壤重金属背景值;(2)As、Cd、Cr、Cu、Hg、Ni、Pb和Zn质量浓度平均值分别为8.33、0.39、116.37、43.40、0.52、56.57、48.45、72.29 mg/kg,Cd超过了《土壤环境质量农用地土壤污染风险管控标准(试行)》(GB 15618—2018)的农用地重金属风险筛选值,Hg、Cr、Ni、Cd和Pb累积较为严重;(3)风险评价结果表明,Hg的平均地累积指数和潜在生态危害指数都最高,为最主要的污染重金属,研究区总体处于中等或较强生态危害。
8 heavy metals(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)in the vertical profiles were analyzed which collected from arable land surrounding an aluminum factory in Baiyun District of Guiyang City.Risk assessment was conducted by geoaccumulation index and potential ecological hazard index.Results showed that:(1)the contents of 8 heavy metals decreased from surface to bottom though fluctuation,gradually approaching or below background value of Guiyang City.(2)The mean mass concentrations of As,Cd,Cr,Cu,Hg,Ni,Pb and Zn were 8.33,0.39,116.37,43.40,0.52,56.57,48.45 and 72.29 mg/kg,respectively.The mean mass concentration of Cd exceeded the risk screening value of heavy metals in agricultural land of“Soil environmental quality-risk control standard for soil contamination of agricultural land”(GB 15618-2018),and Hg,Cr,Ni,Cd and Pb were heavily accumulated.(3)The results of risk assessment showed that both the average geoaccumulation index and the single heavy metal’s potential ecological hazard index of Hg were the highest,indicating it was the main pollution heavy metal.The total potential ecological risk was at medium to strong degree.
作者
蔡雄飞
赵帅
王济
宣斌
赵士杰
张帅
CAI Xiongfei;ZHAO Shuai;WANG Ji;XUAN Bin;ZHAO Shijie;ZHANG Shuai(School of Geography&Environmental Science,Guizhou Normal University,Guiyang Guizhou 550025;The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province,Guiyang Guizhou 550025)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2021年第9期1183-1188,共6页
Environmental Pollution & Control
基金
国家自然科学基金青年科学基金项目(No.41807336)
贵州省科技支撑计划项目(黔科合支撑〔2017〕2580)
贵州省科技计划项目(黔科合基础〔2019〕1213)
贵州师范大学学术学位授权点-环境科学与工程硕士学位授权点2021专项资金(No.210-0418001)。
关键词
耕地土壤
垂直剖面
重金属
风险评价
arable soil
vertical profile
heavy metals
risk assessment
