山东济南市先行区浅层地下水有机污染特征

Characteristics of organic pollution in the shallow groundwater,Jinan pilot area,Shandong Province

为初步了解山东济南市先行区浅层地下水有机污染现状,根据研究区68件内浅层地下水有机物检测结果,统计了检出组分、检出率、超标率,评价检出有机污染物环境影响程度,分析其平面分布特征和季节变化规律,认为,区内浅层地下水有机污染物1,2-二氯乙烷、苯并(a)芘检出率较高,苯并(a)芘超标率和超标倍数最高。有机污染评价显示苯并(a)芘环境影响度ASi计算值为6.0>1.0,已经在某些地区影响了环境健康。研究区浅层地下水有机污染平面上呈点状分布,在组分上呈现复合污染特征,且有机物检出率、超标率具有明显的季节性,检出率丰水期>枯水期,最大超标倍数丰水期>枯水期,分析原因与丰水期大气降水溶解入渗有关。

To get a preliminary understanding of the organic pollution status of shallow groundwater in the study area,according to the results of 68 shallow groundwater organic compounds in the study area,counted the detected components,detection rate,and o⁃ver-standard rate,and evaluated the environmental impact of the detected organic pollutants,analyzed its characteristics of plane dis⁃tribution and seasonal changed,we found that,the detection rate of sym-Dichloroethane and benzo(a)pyrene is relatively high,espe⁃cially benzo(a)pyrene,its over-standard rate and over-standard multiple are the highest.The evaluation of organic pollution shows that the benzo(a)pyrene environmental impact ASi is 6.0>1.0,has affected environmental health in some areas.The organic pollution of shallow groundwater in the study area is distributed in a point-like manner,and presents a compound pollution characteristics in the composition,and,the detection rate and over-standard rate of organic pollution have obvious seasonality,detection rate:Flood season>Dry season,over-standard rate:Flood season>Dry season.It may be related to the infiltration of atmospheric precipitation during the flood season.