微小铅锌矿区土壤和植物重金属污染特征及风险评价

    Heavy Metal Pollution of Soil and Plants in Areas of Micro-Sized Lead-Zinc Mine and Risk Assessment

    • 摘要: 对华东某微小型铅锌矿点周边农田土壤和植物进行采样调查,结合不同土壤剖面土壤样品,分析、评价其土壤和植物中重金属的污染特征,并探讨蔬菜中重金属对当地居民的潜在健康风险。结果表明,矿点周边土壤受到不同程度的重金属污染,单因子污染指数法评价结果显示镉的污染程度最严重,所采集的11个土壤样品中有1个样点属中度污染,其余均属重度污染。对污染程度最低的剖面土壤进行分析后发现,研究区内较高的土壤重金属含量主要与采矿活动有关,同时也受到土壤母质的影响。研究区内农作物均受到不同程度的镉和铅污染,长期食用当地生产的蔬菜可引起潜在的人体健康风险,种植桑树(Morus alba)是当地污染农田的合理利用模式之一。

       

      Abstract: Samples of soil( soil profiles) and plants were collected from farmlands around a micro-sized lead-zinc mine in East China for analysis and evaluation of heavy metals pollution and further for health risk assessment of the pollution of vegetables to local inhabitants. Results show that the soil around the mining area was polluted by heavy metals to different degrees,and cadmium pollution was the most severe according to the single factor pollution index analysis. Only one out of the total 11 soil samples was moderate in pollution degree,and the rest were severe. The analysis of the soil profile that was the lowest in pollution degree revealed that the high heavy metals pollution of the soil was closely related to the mining activities,and to the soil parent material. The crops in the studied zone were all polluted by cadmium and lead to varying degrees. Long-term consumption of locally produced vegetables may have some potential health risk. Planting Morus alba is a reasonable utilization mode for polluted farmlands in the area.

       

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