摘要
以昭通市农田区域为研究对象,采用点对点协同采样的方法对昭通市农田土壤和蔬菜进行采集,测定了As、Pb、Cu、Zn、Cd和Cr这6种重金属含量.使用地累积指数和潜在生态风险指数对土壤重金属污染进行评价,利用健康风险模型评估蔬菜对人体产生的风险情况.结果表明,研究区土壤存在Cu、Zn、Pb、Cd和Cr污染,相较于农用地风险筛选值,超标率分别为34.35%、6.87%、2.29%、80.15%和6.11%;蔬菜存在Pb、Cd和Cr污染,相较于食品中污染物限量,超标率分别为6.87%、15.27%和36.64%.土壤污染评价表明,土壤重金属Cd存在强生态风险,其余重金属存在轻微生态风险.人体健康风险评估模型显示,非致癌风险及致癌风险均超过可接受范围,且对儿童的影响更大.相关性分析表明,土壤中的As对蔬菜吸收Cu和Zn具有拮抗作用,而土壤中Cr对蔬菜吸收Cu和Zn具有促进作用.
A farmland area in Zhaotong City was taken as the research object,and the method of point-to-point collaborative sampling was used to collect farmland soil and vegetables in Zhaotong and test the content of six heavy metals,namely As,Pb,Cu,Zn,Cd,and Cr.The geo-accumulation index and potential ecological risk index were used to evaluate the heavy metal pollution of soil.The health risk model was used to evaluate the risk to the human body imposed by vegetables.The results showed that Cu,Zn,Pb,Cd,and Cr pollution existed in the research area.Compared with the risk screening value of farmland,the over-standard rates were 34.35%,6.87%,2.29%,80.15%,and 6.11%,respectively;Pb,Cd,and Cr were found in vegetables.Compared with the pollutant limit in food,the over-standard rates were 6.87%,15.27%,and 36.64%,respectively.According to the soil pollution evaluation,Cd in the soil showed a strong ecological risk,and other heavy metals in the soil showed a mild ecological risk.The human health risk evaluation model showed that both non-carcinogenic risk and carcinogenic risk were out of the acceptable range and had a greater influence on children.Correlation analysis showed that As in the soil had an antagonistic effect on Cu and Zn absorption by vegetables,whereas Cr in the soil could promote Cu and Zn absorption by vegetables.
作者
张好
董春雨
杨海婵
孙思静
韩宇
黄祖志
张乃明
包立
ZHANG Hao;DONG Chun-yu;YANG Hai-chan;SUN Si-jing;HAN Yu;HUANG Zu-zhi;ZHANG Nai-ming;BAO Li(College of Resources and Environment,Yunnan Agricultural University,Kunming 650201,China;Yunnan Provincial Soil Fertilization and Pollution Remediation Engineering Research Center,Kunming 650201,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2024年第2期1090-1097,共8页
Environmental Science
基金
NSFC-云南联合基金项目(U2002210)。
关键词
农田土壤
重金属
蔬菜
健康风险评价
相关性
agricultural soil
heavy metals
vegetables
health risk evaluation
correlation
作者简介
张好(1997-),女,硕士研究生,主要研究方向为土壤重金属污染修复,E-mail:zhanghao74586@163.com;通信作者:,包立,E-mail:bbllty@163.com。
