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三江平原典型农作区作物籽粒重金属健康风险评价

Health risk assessment of heavy metals in seeds of different crops in typical agricultural area of Three River Plain

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【作者】 周涛苏小四宋铁军何锦梁玉凯刘聪

【Author】 ZHOU Tao;SU Xiao-si;SONG Tie-jun;HE Jin;LIANG Yu-kai;LIU Cong;Key Laboratory of Groundwater Resources and Environment,Ministry of Education,Jilin University;

【通讯作者】 苏小四;

【机构】 吉林大学地下水资源与环境教育部重点实验室吉林大学水资源与环境研究所中国地质调查局水文地质环境地质调查中心天津市勘察院

【摘要】 目的研究三江平原地区主要粮食作物的重金属含量特征和健康风险评价。方法于2017年9—10月,在三江平原大兴农场地区选择水稻采样点48个、玉米采样点9个以及大豆采样点12个,检测不同农作物籽粒中Zn、Hg、Cu、Cr、Ni、As、Cd和Pb的含量,分别运用单因子污染指数法、综合污染指数法和目标危害商数(THQ)法对农作物重金属含量及健康风险进行评价。结果在所有水稻、玉米和大豆籽粒样品中,Zn含量均最高,其次是Cu含量,且远高于其他几种重金属的含量。大豆籽粒中的Cu和Ni含量远高于水稻和玉米籽粒中的Cu和Ni含量,水稻籽粒中的As含量高于玉米和大豆籽粒中的As含量,其他几种重金属在不同农作物籽粒中的含量较为接近。14.58%和6.25%的水稻籽粒中Ni和As含量超标,33.33%的玉米籽粒中Ni含量超标,83.33%的大豆籽粒中Ni含量超标。三种农作物中重金属的单因子污染指数大小顺序均为Ni>As>Zn>Cu>Cr>Hg>Pb>Cd。农作物籽粒中重金属综合污染指数平均值为0.72,整体处于警戒线内。8种重金属的健康风险指数(THQ)和三种农作物的总THQ均小于1,水稻籽粒中的As含量对总THQ的贡献率最大,玉米籽粒中As和Zn含量对总THQ的贡献率最大,大豆籽粒中Cu和Ni含量对总THQ的贡献率最大。水稻、玉米、大豆中重金属对儿童和成人的健康风险(THQ)分量为0.215~0.843和0.164~0.617。结论该地区重金属通过不同农作物摄入不会对人体健康带来风险,儿童受到的潜在健康风险高于成人。

【Abstract】 Objective To understand the content characteristics and health risks of heavy metals in crops in Three River Plain.Methods A total of 48 rice sampling sites,nine corn sampling sites and 12 soybean sampling sites were selected in Daxing Farm area of Three River Plain from September to October in 2017.The contents of Zn,Hg,Cu,Cr,Ni,As,Cd and Pb in seeds of different crops collected from sampling sites were determined,health risk assessment was performed using single factor pollution index method,comprehensive pollution index method and target hazard quotient method. Results Among all seeds samples of rice,corn and soybean,the content of Zn was the highest,followed by Cu,which was much higher than those of other heavy metals. The contents of Cu and Ni in seeds of soybean were much higher than those in rice and corn,the content of As in seeds of rice was higher than those in corn and soybean,and the content of other heavy metals in seeds of different crops was close.The over standard rates of the content of heavy metals in crops were 14.58% for Ni and 6.25% for As in rice,33.33%and 83.33% for Ni in corn and soybean respectively.The average single factor pollution indices in three corps were ranked as follows:Ni>As>Zn>Cu>Cr>Hg>Pb>Cd.The mean value of comprehensive combined pollution index in all samples was 0.72,which was below the alert line.Health risk assessment indicated that the values of the target hazard quotient(THQ) for single and total heavy metals were all less than 1.The most contribution to total THQ was As in rice,As and Zn in corn,Cu and Ni in soybean seeds. THQs of heavy metals in seeds of rice,corn and soybean were 0.215-0.843 for children and 0.164-0.617 for adults. Conclusion The intake of heavy metals in different crops in the investigated region presents higher potential health risks for children compared with adults,both of which will induce no damage to human health.

【关键词】 三江平原农作物金属,重健康风险
【Key words】 Three River PlainCropsMetal,heavyHealth risk
【基金】 中国地质调查局东北黑土地1:25万土地质量地球化学调查项目(121201012000150018)
  • 【文献出处】 环境与健康杂志 ,Journal of Environment and Health , 编辑部邮箱 ,2018年10期
  • 【分类号】R12
  • 【下载频次】49
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