会理南阁乡植烟土壤中铅、镉、铬、砷含量测定及污染评价

The Determination and Pollution Evaluation Analysis of the Content of the Heavy Metals—Lead,Cadmium,Chromium and Arsenic,in Tobacco Planting Soil of Nange Township Huili County

以会理县南阁乡植烟土壤为标准农化样研究对象,农化样消解后用ICP原子吸收光谱仪进行Pb、Cd、Cr、As四种重金属含量测定,并采用单因子指数法对污染状况进行评价研究。研究结果表明,南阁乡植烟土壤中四种重金属的百分含量平均值分别为:Pb 289.17mg/kg,Cd 6.25mg/kg,Cr 73.92mg/kg,As 16.08mg/kg,与土壤环境质量标准值相较后得知Cd属于重度污染、Pb属于中度污染、Cr为无污染、As为轻微污染。在对植烟土壤健康风险、生态风险的污染评价中,Pb健康风险值处于低风险等级,生态上的风险评估Pb是具有中等风险等级的;Cd由于严重超标为高风险等级。由此可以看出,会理县南阁乡植烟土壤重金属中Pb、Cd含量并不容乐观,值得引起长期的高度重视。

The tobacco planting soil of Nange township Huili county is collected as a standard sample. After the sample digested, the ICP atom absorption spectrum apparatus in used to determine the heavy metal content of lead, cadmium, arsenic and chromium in the sample, and the single factor index method is used to evaluate and analyse the pollution status. The results of the study show that the average percentage of this 4 kinds of heavy metals in the tobacco planting Compared with th soil of Nange township is： Pb 289.17 mg/kg, Cd 6.25 mg/kg, Cr 73.92 mg/kg, As 16.08 mg/kg e soil environmental quality standard values, Cd belongs to severe pollution grade, Pb belongs to moderate pollution grade, while the rest is free from contamination or belongs to light pollution grade. In the evaluation of the health risks and ecological risks of tobacco planting soil, Pb health values are in a low risk level, and Pb ecological risks are in a medium risk level. Cd is in a high risk level because of exceeding badly. We can see from this, the status of the heavy metal content of the tobacco planting soil of Nange township of Huili county is not optimistic, and it is worth our long-term attention.