河口县农村菜地土壤中铅镉及蛔虫卵污染调查

目的:对河口农村菜地土壤中重金属铅镉及蛔虫卵的污染调查,为客观评价农村环境卫生状况提供科学依据和支持。方法:对河口县的5个乡镇的20个行政村的菜地土壤进行采样分析。结果:以国家《土壤环境质量标准(》GB15618-2008)二级标准作为评价标准,只有南溪镇的一个土样中铅含量超过国家标准限值,达标准限值的5.62倍,为重度污染,其余土样均在国家二级标准的限值范围内。结论:河口县农村菜地95%土壤中铅镉含量没有超过国家二级标准,但80%的土样超过云南省的背景值,70%的菜地土壤中检出活的蛔虫卵,粪便没有进行无害化处理就施用。

Investigation on the pollution situation of lead,cadmium and ascarid eggs in soil of the rural vegetable field of Hekou county

Objective:To investigate the pollution situation of lead,cadmium and ascarid eggs of the soil in the rural vegetable field of Hekou county and provide the scientific basis and support for the objective evaluation of the situation of the rural environmental sanitation in Hekou county.Methods: The soil samples of the rural vegetable field from 20 administrative villages of five towns in Hekou county were collected and analyzed.Results: According to the secondary standard of "Soil environmental quality standards"(GB15618-2008),only lead concentration in one of the soil samples of Naxi town was more 5.62 times than the standard limits,evaluated as the severe pollution.While the lead and cadmium concentrations and the quantity of ascarid eggs in soil samples of other towns were lower than the limited valus of the secondary standard.Conclusion: In rural areas of Hekou county,levels of lead and cadmium in 95% of the soil samples were in line with the national secondary standard,but 80% of soil samples exceeded the background levels required by Yunnan province.At the same time,the detection rate of living ascarid eggs were 70%,which indicated that the excrement was utilized without the harmless treatment.