西咸新区泾河新城地下水质量综合评价

Comprehensive Evaluation on Groundwater Environmental Quality in Jinghe Xincheng of Shaanxi Xixian New District

通过实地调查陕西省西咸新区泾河新城地下水环境,采用F值法和改进的内梅罗指数法两种综合指数法,选取总硬度、溶解性总固体、硫酸盐、氯化物、高锰酸盐指数、硝酸盐、亚硝酸盐、氨氮、氟化物、砷、铬(Cr^(6+))11项评价指标,对该区11个地下水水样进行地下水质量综合评价。结果表明:F值法突出最大污染因子的影响,影响整体评价结果;改进的内梅罗指数法考虑评价指标权重值,减小最大污染因子的影响,使评价结果更加客观、准确;该区地下水质量整体状况较差,主要超标指标为硝酸盐、硫酸盐、溶解性总固体、总硬度、氟化物、氯化物、铬(Cr^(6+))、亚硝酸盐、氨氮,其中硫酸盐影响最大。

According to the field investigation on groundwater environment at Jinghe Xincheng of Xixian New District in Shaanxi Province, F value method and the improved Nemerow index method, these two composite index methods were adopted, and total hardness, total dissolved solids, sulfate, chloride, potassium permanganate index, nitrate, nitrite, ammonia, fluoride, arsenic and chromium （ Cr^6＋ ） , these 11 evaluation indexes were chosen to conduct a comprehensive analysis and evaluation on 11 groundwater samples about the groundwater environmental quality. The results show that the impact of the maximum contamination factor of F value method is highlighted, which affects the overall result; as the improved Nemerow index method considers the weights of evaluation index, so the influence of the maximum contamination factor is decreased, which makes the evaluation results more objective and accurate; the mainly excessive indexes in this research area are nitrates, sulfates, dissolved solids, total hardness, fluoride, chloride and hexavalent chromium （Cr6＋）; the overall condition of groundwater environment quality is poor in the area.