| 典型锡矿开采加工活动集中区域农田土壤重金属污染评价与源解析 |
| 摘要点击 1687 全文点击 332 投稿时间：2023-07-23 修订日期：2023-11-09 |
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| 中文关键词 锡（Sn）矿 农田 土壤重金属 健康风险评价 源解析 |
| 英文关键词 tin（Sn） ore farmland heavy metals in soil health risk assessment source apportionment |
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| 中文摘要 |
| 研究典型矿业开采加工活动集中区域农田土壤重金属污染状况与源解析,是推动矿山集中开采区农田土壤生态修复和农田保护的重要前提.通过采集西南地区某矿业开采区周边农田土壤,检测其重金属含量,并运用地累积指数法、综合污染指数法、克里金插值法、健康风险评价法和PMF受体模型对重金属的污染状况、分布规律、健康风险和来源进行研究.结果表明,农田土壤中8种重金属除Ni外其他均值超过了当地土壤背景值.地累积指数评价结果为：Cd和Hg处于极度污染,Pb和As为中污染-重污染,Cr、 Zn、 Ni和Cu污染程度较轻.健康风险评价中经口摄入为主要暴露途径,且对人体构成健康风险,构成非致癌健康风险的主要元素为As,致癌风险则为As、 Cd. PMF模型解析得出：含铁矿石的风化自然源贡献率为28.02%,主要因子为Ca和Fe；农业源贡献率为3.02%,主要因子为Pb和As；工业和大气沉降综合源贡献率为33.09%,主要因子为Hg；成土母质源贡献率为17.27%,主要因子为Ca；采矿与冶炼等矿业活动源贡献率为18.60%,主要因子为Zn和Cd. |
| 英文摘要 |
| Studying the status and source analysis of heavy metal pollution in farmland in typical mining and processing areas is an important prerequisite for promoting farmland soil ecological restoration and farmland protection in concentrated mining areas. In this study, the heavy metal content of farmland soil around a mining area in southwest China was detected, and the pollution status, distribution law, health risks, and sources of heavy metals were studied by using the land accumulation index method, comprehensive pollution index method, kriging interpolation method, health risk assessment method, and PMF receptor model on the sampling data. The results showed that the mean values of eight heavy metals in farmland soil except Ni exceeded the local soil background values, and the results of the ground accumulation index evaluation showed that Cd and Hg were extremely polluted； Pb and As showed medium pollution-heavy pollution； and Cr, Zn, Ni, and Cu were lightly polluted. In the health risk assessment, oral ingestion was the main exposure route posing a health risk to the human body； the main element that constituted non-carcinogenic health risks was As, and the carcinogenic risks were from As and Cd. PMF model analysis showed that the contribution rate of weathering natural sources of iron-bearing ore was 28.02%, and the main factors were Ca and Fe. The contribution rate of agricultural sources was 3.02%, and the main factors were Pb and As. The contribution rate of industrial and atmospheric deposition composite sources was 33.09%, and the main factor was Hg. The contribution rate of the parent material source was 17.27%, and the main factor was Ca. The contribution rate of mining activities such as mining and smelting was 18.60%, and the main factors were Zn and Cd. |
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