贵州普安铅厂尾库矿土壤污染特征及风险评价

贵州省是矿产资源最为丰富的省份之一.但不合理的矿产资源开采和矿渣堆积,导致周边土壤受到不同程度的污染,并伴生相关生态环境问题.以贵州省普安县铅厂尾库矿周围污染土壤为研究对象,通过详细的现场调查,以及对土壤进行取样测试砷、镉、铜、铅、汞、镍等元素含量,查明了研究区土壤污染源特征和分布.研究结果表明:研究区未发现危险废物,区内废渣属二类固体废物;土壤的污染途径主要包括有毒有害物质及污染物贮存、遗撒引起的扩散迁移以及干湿沉降造成的污染;土壤中砷的所有暴露途径的总致癌风险大于10-6,砷的总危害指数大于1,部分点位超过第二类用地土壤污染风险管控值,地块存在一定的风险.其研究结果可为污染土壤的改性和风险管控措施研究提供参考依据.

Soil Pollution Characteristics and Risk Assessment of the Tailings Mine in Pu''an, Guizhou

Guizhou Province is one of the provinces with the richest mineral resources. While unreasonable mining of mineral resources and accumulation of slag have resulted in varying degrees of pollution in the surrounding soil and associated ecological and environmental problems. Taking the polluted soil around the lead factory tailings mine in Pu''an County, Guizhou Province as the research object, through detailed on-site investigation and sampling the soil to test the content of arsenic, cadmium, copper, lead, mercury, nickel and other elements, the soil in the research area was found out the characteristics and distribution of pollution sources. The research result shows that: No hazardous waste was found in the study area, and the waste residue in the area belongs to Class II solid waste. The soil pollution methods mainly include toxic and hazardous substances and pollutants storage, spreading and migration caused by spillage and Pollution caused by dry and wet deposition.The total carcinogenic risk of all exposure pathways of arsenic in the soil is greater than 10-6, the total hazard index of arsenic is greater than 1, and some points exceed the control value of soil pollution risk for the second type of land. There are certain risks. The results of the study provide a reference for the research on the modification of contaminated soil and risk management and control measures.