摘要
为了解贵州丹寨—三都汞矿区玉米、水稻和辣椒等农作物及土壤中重金属污染状况和食用健康风险,选取丹寨—三都汞矿区排庭、高排、王家寨、水家湾、拉峨、阳冬村、高寨、大寨等8个村镇,分析测试玉米、水稻和辣椒等农作物及土壤中重金属含量,并评价农作物中重金属对人体的健康风险。结果表明,与农作物重金属限量(GB 2762-2017、GB 15199-1994、GB 13106-1991)、欧盟、世界卫生和联合国粮农组织(WHO/FAO)标准相比,研究区土壤单因子和综合污染指数显示,研究区玉米中重金属含量低于标准,土壤受到As污染,土壤综合污染指数均值为2.17,处于中度污染。玉米中10种重金属富集系数和转移因子的大小顺序为Zn>Sn>Se>Mo>Cd>Cu>As>Hg>Pb>Cr和Zn>Mo>Cu>Cd>Sn>Se>As>Hg>Pb>Cr;玉米Zn、Se、Mo的富集系数和转移因子为0.2164、0.2432、0.0658和1.8051、0.1056、1.3669。健康风险评价结果表明,成人食用玉米重金属健康风险指数(HQ)值均小于1,而儿童As的HQ大于1,其余重金属HQ值小于1。
Objectives: The study area is located in Danzhai-Sandu mercury-gold mining area. However, there are few studies on soil-maizes system in Danzhai-Sandu mercury mining area. The geochemical characteristics of soil-maize system elements and the enrichment mechanism of Se, Mo and Zn in maize were studied in this paper.Methods: Field investigation and systematic sampling are conducted in this paper. The elements in soil and crops were analyzed by ICP-MS and ICP-AES, the pH value of soil was determined by PHS-3 C p H meter, and the correlation between elements was analyzed by SPSS.Results: The contents of heavy metals in maize were lower than the standard which included GB 2762-2017, EU and WHO/FAO. The soil single factor and comprehensive pollution index showed that the soil was contaminated by As, and the soil comprehensive pollution index averaged 2. 17, which was moderately polluted. The orders of ten heavy metals enrichment factors and transfer factors in maize are Zn>Sn>Se>Mo>Cd>Cu>As>Hg>Pb>Cr and Zn>Mo>Cu>Cd>Sn>Se>As>Hg>Pb>Cr, respectively. The enrichment factors and transfer factors of Se, Mo and Zn in maize were 0. 2432, 0. 0658, 0. 2164 and 0. 1056, 1. 3669, 1. 8051, respectively. The health risk assessment of maize showed that the HQ values of heavy metals in adult corn were less than 1, while the HQ of children As was greater than 1, and the HQ of other heavy metals was less than 1, which had not threatened human health.Conclusions: The contents of heavy metals such As and Hg in the soil of the mining area are higher, exceeding the background values of Guizhou and China, while the contents of heavy metals such As and Hg in corn are lower, while the contents of beneficial elements Se, Mo and Zn are higher. And the correlation analysis shows that the correlation between Se, Mo, Zn elements is obvious, and the correlation between Se, Mo and Zn elements is not obvious, which may be related to the mining area soil rock weathering, It can be seen that under alkaline conditions, Se, Mo, Zn elements are easy to mig
作者
倪莘然
杨瑞东
陈蓉
张建
刘春林
NI Xinran;YANG Ruidong;CHEN Rong;ZHANG Jian;LIU Chunlin(College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;College of Mining,Guizhou University,Guiyang,550025)
出处
《地质论评》
CAS
CSCD
北大核心
2020年第4期1031-1042,共12页
Geological Review
基金
贵州省教育厅创新群体重大研究项目(编号:黔教合KY字[2016]024)
国家自然科学基金地区科学基金项目(编号:41463009)
贵州省国内一流学科(生态学)建设项目(编号:GNYL[2017]007)的成果。
关键词
有益元素
土壤
重金属
玉米
丹寨—三都汞矿区
beneficial elements
soil
heavy metals
maize
Danzhai-Sandu mercury mining area
