丰台平原区地下水污染评价研究OA

This paper employs the pollution index method to assess groundwater contamination in the Fengtai plain area.In order to reflect both the cumulative impact of long-term pollution and the outcomes of recent remediation efforts,this study innovatively uses early historical data(1954-1963)and recent historical data(2010)as reference values for conducting long-term and short-term pollution assessments,respectively.The results show that compared with the long-term assessment,the short-term assessment reveals a significant improvement in groundwater quality:the dominant pollution grades of total hardness and nitrate nitrogen shift from moderate/heavy pollution to non-polluted;the dominant grade of total dissolved solids changes from moderate pollution to non-polluted;and the comprehensive groundwater pollution grade also shifts from moderate/heavy pollution to non-polluted.Areas classified as extremely heavy pollution in the long-term assessment are rated as moderate pollution in the short-term assessment.Zones identified as severely and heavily polluted in the long-term assessment are mostly categorized as lightly polluted or non-polluted in the short-term assessment,while areas with moderate or light pollution in the long-term assessment are generally non-polluted in the short-term assessment.The combination of the both assessment approaches provides a more comprehensive and objective reflection of the groundwater pollution status.