摘要
为研究云南省某废弃硅厂周边农田土壤重金属污染状况及评价重金属对土壤环境质量的影响,分析了土壤重金属Cd、Cr、Cu、Ni、Pb、Zn、Hg和As的含量,并采用单项污染指数法、内梅罗综合指数法和土壤综合质量影响指数法对土壤重金属污染状况进行了评价。结果表明:废弃硅厂周边农用地土壤重金属Cd、Cr、Cu、Ni、Pb、Zn、Hg和As的平均值分别为0.39、82.04、33.24、44.85、50.62、109.20、0.12 mg·kg^(-1)和34.40 mg·kg^(-1),分别为云南土壤背景值的1.77、1.26、0.72、1.06、1.25、1.22、2.00倍和1.87倍;土壤重金属相关性分析表明,Cd、Zn、Hg、As和Pb呈极显著正相关,可能来自废弃硅厂的煤烟,Cr、Cu和Ni之间呈极显著正相关,并与其余重金属呈显著负相关或不相关,可能来自母质或其他污染源;单项污染指数表明,土壤As存在超标现象,为该地区的主要污染物;内梅罗综合指数表明,靠近硅厂的果园(S1)和稻田(S2)土壤呈轻度污染,远离硅厂的稻田(S3)土壤呈清洁状态;土壤综合质量影响指数表明,靠近硅厂的S1和S2土壤呈亚污染状态,远离硅厂的S3土壤呈清洁状态。研究表明,应该重视该区域农用地的重金属污染问题,并优先开展As污染的修复工作。
To study the pollution status of heavy metals in farmland around an abandoned silicon factory in Yunnan Province and evaluate the impact of heavy metals on soil environmental quality,the Cd,Cr,Cu,Ni,Pb,Zn,Hg,and As contents of soil were analyzed.Soil heavy metal pollution was evaluated using the single pollution index method,the Nemerow index method,and the influence index of the comprehensive quality method.In soil from the study area,the average values of Cd,Cr,Cu,Ni,Pb,Zn,Hg,and As were 0.39,82.04,33.24,44.85,50.62,109.20,0.12 mg·kg^(-1),and 34.40 mg·kg^(-1),respectively,which were 1.77,1.26,0.72,1.06,1.25,1.22,2.00 times,and 1.87 times of the corresponding Yunnan soil background value.Correlation analysis of soil heavy metals showed that Cd,Zn,Hg,As,and Pb were positively correlated with each other,which likely originate from the soot of the waste silicon plant.Cr,Cu,and Ni were positively correlated with each other and negatively correlated with or not correlated with other heavy metals.These metals may originate from parent materials or other pollution sources.The single pollution index showed that As in the soil exceeded the standard and was the main pollutant in this area.The Nemerow index showed that the soil of orchards(S1)and paddy fields(S2)near the silicon plant were slightly polluted,while the soil of paddy fields(S3)was far away from the silicon plant was not polluted.Similarly,the influence index of comprehensive quality showed that the soil of S1 and S2 near the silicon plant were in a sub-polluted state,while the S3 far away from the silicon plant were in a clean state.Therefore,attention should be paid to the heavy metal pollution of agricultural land in this region,and priority should be given to the remediation of As pollution.
作者
刘洋
刘明庆
王磊
尹爱经
黄忠林
姚丹丹
代威
王宁
王辉
LIU Yang;LIU Mingqing;WANG Lei;YIN Aijing;HUANG Zhonglin;YAO Dandan;DAI Wei;WANG Ning;WANG Hui(Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Nanjing Institute of Environmental Sciences,MEE,Nanjing 210042,China;Guangxi Bossco Environmental Protection Technology Co.,Ltd.,Nanning 530000,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2022年第4期785-793,共9页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(42077034)
地方政府委托项目(CN)(Nos.201906,DHHCFW2020028)。
关键词
土壤重金属
污染评价
综合质量影响指数
废弃硅厂
heavy metals in soil
pollution assessment
influence index of comprehensive quality
silicon factory
