泸州市饮用水水源地周边土壤重金属污染状况评估

以泸州饮用水水源地保护区陆域表层土壤(0～20 cm)为研究对象,采用单项污染指数法、潜在生态风险指数法、地累积指数法以及内梅罗污染指数法等评价方法,对泸州饮用水水源地保护区陆域7种土壤重金属元素的污染情况进行评价.成果表明:研究区范围内G05号、S02号、S04号、W08号、W05号点位周围相关区域为Cd元素轻微污染,其余点位区域均属于清洁水平;G05号、S02号、W04号、W05号、W08号、W10号点位区域土壤重金属污染状况属于尚清洁水平,但已属于警戒状态,S04号点位区域土壤重金属污染情况属于轻度污染,而其余点位区域均属于清洁水平;研究区土壤存在一定程度上的金属镉、汞元素污染,最明显致险因子是重金属元素镉,其次是汞,而其他重金属元素对土壤环境质量的影响较小.

Assessment of Heavy Metal Pollution in Soils Around Drinking Water Sources in Luzhou

The surface soil(0~20cm)of the drinking water source protection area in Luzhou was studied by using single pollution index,potential ecological index,geoaccumulation index and nemerow pollution index,the pollution of seven heavy metal elements in soil of drinking water source protection area in Luzhou was evaluated.The results showed that the areas around G05,S02,S04,W08 and W05 were slightly polluted by Cd,and the other areas were clean;G05,S02,W04,W05,W08 and W10 are clean,but they are in the warning level,the heavy metal pollution in the soil of site S04 is at the light level,and the other areas were clean;The most obvious risk factor is the heavy metal element cadmium,next is the mercury,but other heavy metal elements have less infl uence on the soil environmental quality.