摘要
以重庆市煤矸山周边农用地土壤和农产品(玉米和水稻)为研究对象,测定土壤和农产品(玉米和水稻)中Cd含量,评估摄入农产品(玉米和水稻)对人体的潜在健康风险,并基于物种敏感性分布法(SSD)推导土壤环境基准值.结果表明,重庆煤矸山周边旱地土壤Cd含量超风险筛选值的点位占55.8%,水田土壤Cd含量超风险筛选值的点位占31.6%,土壤Cd以较高生态危害和高生态危害为主,分别占47.4%和36.8%.玉米Cd含量超标点位占4.4%,水稻Cd含量均未超标.健康风险评价表明因食用玉米和水稻摄入Cd的非致癌健康风险可忽略,食用玉米摄入Cd存在可耐受致癌健康风险,食用水稻摄入Cd存在不可耐受致癌健康风险,且玉米和水稻Cd含量敏感度最高.SSD推导出煤矸山周边旱地土壤在pH≤5.5、 5.57.5时Cd的环境基准值分别为0.491、 0.382、 0.376和0.588 mg·kg^(-1),水田土壤Cd的环境基准值为0.807 mg·kg^(-1).水田土壤和旱地土壤pH≤7.5时,现行土壤标准(GB 15618-2018)相对偏严;旱地土壤pH>7.5时,现行土壤标准(GB 15618-2018)相对偏宽松.应加强煤矸山周边土壤Cd污染防治和农产品安全利用研究,并对土壤Cd环境基准值进行适当调整.
To analyze the health risk assessment and environmental benchmark of cadmium in farmland soils surrounding the gangue heap of a coal mine in Chongqing,Hakanson,the ecological risk index and health risk assessment were used.Meanwhile,the soil environmental reference value of the regional cultivated land was inverted based on the species sensitive distribution model(SSD).The results showed that the dryland soil was polluted by Cd,with an over⁃standard rate of 55.8%,and the paddy field soil was polluted by Cd,with an over⁃standard rate of 31.6%.The corn was polluted by Cd,with an over⁃standard rate of 4.4%,and the rice was not polluted by Cd.The Hakanson ecological risk index showed that Cd was mainly characterized in soils by high ecological risk and considerable ecological risk.The health risk assessment indicated that Cd presented low non⁃carcinogenic risk by corn and rice;however,it showed acceptable carcinogenic risk by corn and unacceptable carcinogenic risk by rice in this study.The sensitivity analysis of health risks showed that the content of Cd was the most sensitive.The SSD inversion showed that the reference values for Cd in dryland soil of pH≤5.5,5.5<pH≤6.5,6.5<pH≤7.5,and pH>7.5 had HC5 values of 0.491,0.382,0.376,and 0.588 mg·kg^(-1),respectively,and that for Cd in paddy soil had an HC5 value of 0.807 mg·kg^(-1).The reverse analysis showed that the HC5 of Cd in dryland soil(pH≤7.5)and paddy soil was relatively relaxed and was higher than the soil risk screening values,which showed that the current standard was relatively loose.However,the HC5 of Cd in dryland soil(pH>7.5)was lower than the soil risk screening values,which showed that the current standard was relatively strict.It is suggested that the current soil standard could be adjusted in this area.
作者
马杰
佘泽蕾
王胜蓝
邓力
孙静
刘萍
徐敏
MA Jie;SHE Ze-lei;WANG Sheng-lan;DENG Li;SUN Jing;LIU Ping;XU Min(Chongqing Ecological and Environmental Monitoring Center,Chongqing 401147,China;Rural Ecology and Soil Monitoring Technology Research Center,Chongqing 401147,China;Chongqing University of Arts and Sciences,Chongqing 402160,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2023年第9期5264-5274,共11页
Environmental Science
基金
重庆市生态环境局项目(2021-111)。
