有色冶金区土壤-蔬菜系统重金属污染特征及健康风险分析

发布时间：2018-08-09 07:04

【摘要】：采用对应采样方法研究大冶有色冶炼厂周围地区土壤、蔬菜中Cd、Cu、Pb和As的含量,并对蔬菜重金属污染状况、富集能力及健康风险进行了分析。结果表明,研究区土壤重金属污染严重,Cd、Cu、Pb和As平均含量分别达5.28、193.37、93.83和36.56 mg/kg,分别为湖北省对应元素土壤背景值的31.06、6.30、3.51和2.97倍,表现为以Cd为主的多种重金属共同污染。与《食品中污染物限量》(GB2762-2012)标准比较,蔬菜中Cd和Cu含量的样本超标率分别为68%和6%,而As、Pb的含量均不超标。蔬菜中重金属富集能力的排序为:CdCuAsPb,叶菜类蔬菜对Cd、Cu、Pb和As的富集系数均高于非叶菜类蔬菜。土壤和蔬菜重金属综合质量指数达10.07,为重度污染。研究区人群通过蔬菜摄入As、Cd的目标危险系数均大于1,存在As、Cd暴露的健康风险;成人和儿童食用蔬菜而摄入重金属的TTHQ分别为2.11~5.06和2.78~6.64,儿童比成人遭受的健康风险更大,并且距离冶炼厂越近,所遭受的健康风险越大。蔬菜中重金属的复合污染已使大冶有色冶炼厂周围居民面临潜在的健康风险。
[Abstract]:The contents of CD ~ (2 +) Cu ~ (2 +) Pb and as in soils and vegetables around Daye Nonferrous smelter were studied by using the corresponding sampling method. The pollution status, enrichment capacity and health risk of heavy metals in vegetables were analyzed. The results showed that the average contents of heavy metals in the soil were 5.28193.3793.83 and 36.56 mg / kg, respectively, which were 31.066.303.51 and 2.97 times of the background values of the corresponding elements in Hubei Province. Compared with GB2762-2012 standard, the rates of CD and Cu in vegetables were 68% and 6%, respectively, while the contents of As-Pb were not in excess of the standard. The enrichment capacity of heavy metals in vegetables was in the order of 1: CdCuAsPb, and the enrichment coefficients of Pb and as in leafy vegetables were higher than those in non-leafy vegetables. The comprehensive mass index of heavy metals in soil and vegetables was 10.07, which was serious pollution. In the study area, the target risk factors of intake of Asfen and CD through vegetables were all greater than 1, and there was a health risk of exposure to ASH CD in adults and children, and the TTHQ of heavy metals intake in adults and children were 2.115.06 and 2.780.64, respectively. The health risks of children were higher than those of adults. And the closer the smelter, the greater the health risk. The compound pollution of heavy metals in vegetables has exposed the residents around Daye Nonferrous smelter to potential health risks.
【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;长江大学资源与环境学院;中国科学院广州地球化学研究所有机地球化学国家重点实验室;中山大学水资源与环境系;环境保护部华南环境科学研究所;
【基金】：国家自然科学基金项目(41203061) 湖北省自然科学基金项目(2015CFB603) 湖北省教育厅科学技术研究重点项目(D20161301) 有机地球化学国家重点实验室开放基金(OGL-201408) 长江大学大学生创新创业训练项目(2015007,2016006)~~
【分类号】：X53;X825

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