广东省石灰岩矿区土壤铅污染现状研究——以梅州市五华县为例

Contaminated Soil Status by Pb in the Limestone Mine Area of Wuhua County

为调查广东省石灰岩矿区土壤铅污染的现状,选择梅州市五华县几个石灰岩矿区周边土壤进行了铅的含量测定,并初步评价了土壤铅污染的状况。结果显示五华县土壤铅的含量超出了国家土壤环境质量标准的二级标准即土壤污染的起始值,且污染土壤铅含量要比未污染的土壤铅含量要高出一倍多,远远超出国家三级标准即对土壤生态环境产生影响的最低浓度值(即警戒值),对生态产生影响。根据内梅罗污染指数评定得出矿区污染土壤铅污染达到了重污染的程度。为减轻土壤铅污染对生态环境的危害应及时采取措施控制污染源和因地制宜选择经济有效的修复方法或其组合。

Pb content of soil in the sampled limestone mine area , i. e. Wuhua County, Guangdong Province was examined and the contamination level was evaluated. The results show that the Pbcontent in sample soil is well above the secondary standard and far above the tertiary standard of the environmental quality standard for soils , the teriary standard being considered as the environmentally permitted minimal concentration, i. e. , breakpoint . The results also reveal that the Pb content of the contaminated soil is as much as two times in contrast with the uncontaminated soil , which do harms to the ecological environment. It is concluded from Nemerow Pollution Index Assessment that the Pb contamination in sample area arrived to a serious level . Thus , effective and facile measures to control the pollution source and to restore the contaminated soil must be promptly adopted so as to lower the pollution degree.