摘要
在琼北土壤重金属高背景值区采集农田土壤及采样点附近的蔬菜、水果、大米和杂粮等农产品样品,测定其中的Pb、Cd、Cu、Zn、Ni含量,并采用美国环保局(USEPA)推荐的健康风险评价模型对蔬菜、水果、大米和杂粮等4类农产品中的重金属,经膳食摄入对成年男性、女性和儿童造成的健康风险做出评价。结果表明:(1)土壤及4类农产品中重金属Pb、Cd、Cu、Zn、Ni存在不同程度的超标现象。(2)成年人群通过膳食摄入5种重金属造成的健康风险大小为HICu>HIZn>HICd>HINi>HIPb。相比成年人群,儿童面临风险更大,其健康风险大小为HINi>HICd>HIZn>HICu>HIPb。(3)4类农产品经膳食摄入途径引发的健康风险程度排序为蔬菜>大米>杂粮>水果。(4)4种膳食中Pb引发的致癌风险除个别地区外,均在可接受范围内。蔬菜、大米和杂粮摄入途径的Cd引发的致癌风险大于可接受风险水平10-6。此结果说明长期食用此地区的蔬菜、水果、大米和杂粮可能会带来较高的健康风险。
In this study, the concentrations of heavy metals（e.g. Pb, Cd, Cu, Zn and Ni） in the farmland and the surrounding agricultural products such as vegetables, fruits, rice and coarse cereals were investigated in northern Hainan where higher concentrations of heavy metals are related to the mother rocks. The health risk assessment model recommended by United States Environmental Protection Agency（ USEPA） was used to assess the potential health risks of heavy metals to local inhabitants（ adult males, females and children） via dietary consumption of the selected agricultural products. The results showed that：（1） The concentration of Pb, Cd, Cu,Zn and Ni in the soil and four kinds of agricultural products in the studied area exceed the corresponding values according to national standard.（ 2） Among the five types of excessive heavy metals in the selected agricultural products, copper induces higher danger to adults than that of zinc, and followed by cadmium, nickel, and lead（i.e. HICuHIZnHICdHINiHIPb） via dietary intake. By comparison, children stand more danger than adults, and the degree of health risks caused by the heavy metals followed an order of HINiHICdHIZnHIPbHICu.（3） The health risk caused by direct intake of vegetables is greater than that of rice, coarse cereals and fruit, respectively.（4）The carcinogenic risk of lead caused by daily intake of these agricultural products was within the acceptable limits in the investigated region, except for some areas. The carcinogenic risks of copper caused by daily intake of vegetables, rice and coarse cereals were higher than the acceptable level（i.e. 10-6）, which indicated that higher health risk would be caused by long-term intake of the vegetables, fruits, rice and coarse cereals from the investigated areas.
出处
《热带作物学报》
CSCD
北大核心
2018年第1期189-196,共8页
Chinese Journal of Tropical Crops
基金
国家自然科学基金项目(No.21467008)
海南省重大科技计划项目(No.ZDKJ2017002)
海南省自然科学基金(No.212012)
关键词
高背景值区土壤
重金属
农产品
健康风险评价
soils with high background values
heavy metals
agricultural products
health risk assessment
