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| 贵州铜仁典型锰矿区土壤及蔬菜重金属污染特征及健康风险评价 |
| Characteristics and health risk assessments of heavy metals in soils and vegetables in manganese mining areas in Tongren County, Guizhou Province, China |
| 投稿时间：2019-02-04 |
| DOI：10.13254/j.jare.2019.0066 |
| 中文关键词: 重金属，土壤，蔬菜，健康风险评估 |
| 英文关键词: heavy metal, soil, vegetables, health risk evaluation |
| 基金项目:贵州省环境保护厅环境科技项目（黔环科[2016]1号）；贵州省科技计划项目（黔科合LH字[2017]7291号） |
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| 中文摘要: |
| 为了解锰矿区土壤和蔬菜重金属的污染特征，评价其健康风险，以贵州铜仁杨立掌、白岩溪、盆架山与鹏程典型锰矿区土壤和蔬菜为研究对象，按离矿区不同距离采集2.0 km范围内的土壤和蔬菜，分析测试土壤、蔬菜（辣椒、白菜、南瓜、茄子、豇豆）样品中重金属组成及含量，采用单因子污染指数法和综合污染指数法对土壤重金属污染进行评价，以健康风险评估模型对人群长期食用矿区附近蔬菜可能产生的健康风险进行评价。结果显示，矿区土壤Mn、Hg平均含量分别为贵州省土壤背景值的2.56、1.55倍，Cd平均含量为《土壤环境质量农用地土壤污染风险管控标准（试行）》（GB 15618-2018）中限值的2.20倍。综合污染指数分析表明：盆架山矿区为重度污染，杨立掌矿区为中度污染，白岩溪与鹏程矿区为轻度污染。蔬菜重金属健康风险评价结果表明：致癌风险（RT）平均值为4.31×10-6 a-1，尚可接受；非致癌风险（HIT）为4.21×10-9 a-1，人体健康风险甚微。研究表明，锰矿区土壤已受到不同程度的重金属污染，蔬菜的食用风险尚在可接受范围内。 |
| 英文摘要: |
| To explore the characteristics of manganese pollution in manganese mining areas, and evaluate the health risk of heavy metal pollution in vegetables, samples of soil and vegetables were collected in Yanglizhang, Baiyanxi, Penjiashan, and Pengcheng. These are manganese mining areas in Tongren County, Guizhou Province, China. Samples were collected from within a 2.0 km range, at different distances from the mining area. The composition and content of heavy metals in the soil and vegetables samples(including capsicums, cabbages, pumpkins, eggplants, and cowpeas) were analyzed and measured. Soil that was contaminated with heavy metals was evaluated using both the single pollution index method and the comprehensive pollution index method. The health risk assessment model was used to evaluate the chronic health risk caused by eating vegetables that were grown near mining areas. The results showed that the average content of Mn and Hg were 2.56 and 1.55 times, respectively, that of the soil background values in Guizhou, and the average Cd content was 2.20 times higher than that of the value specified in the Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (GB 15618-2018). An analysis of the comprehensive pollution index showed that the Penjiashan mining area was heavily polluted, the Yanglizhang mining area was moderately polluted, and the Baiyanxi and Pengcheng mining areas were slightly polluted. The results of health risk assessment of heavy metals in the vegetable samples showed that the average value of RT(carcinogenic risk) was 4.31×10-6 a-1, which was acceptable. The HIT(non-carcinogenic risk) value was 4.21×10-9 a-1, indicating that the risk of the occurrence of non-carcinogenic heavy metals in vegetables to human health was negligible. In other words, there have been varying degrees of heavy metal contamination in manganese mining areas, but the health risks by eating vegetables grown in these regions is still within an acceptable range. |
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