新疆石河子地区地下水质量与污染评价

Assessment of Groundwater Quality and Pollution in Shihezi Area of Xinjiang

采用层级阶梯评价方法对石河子地区2014年的23组地下水水样进行了地下水质量与污染评价。地下水质量评价结果为地下水水质较差,影响潜水质量的主要因素是pH值和耗氧量,影响浅层承压水质量的主要因素为pH值、耗氧量、总硬度、TDS、Al^(3+)、SO_4^(2-)、总Fe和Mn,影响深层承压水质量的主要因素为pH值和耗氧量,当地混合井的开采导致承压水质量劣于潜水质量。地下水污染评价结果:潜水污染等级为1级,浅层承压水污染等级为1级、2级和3级的井数分别占调查总井数(8眼)的75.0%、12.5%、12.5%,深层承压水污染等级为1级、2级和3级的井数分别占调查总井数(10眼)的40.0%、20.0%、40.0%。研究区地下水水质劣化主要受地表水水质及土地利用类型的影响,有机物污染源对其影响不大。

This study used the hierarchical step evaluation method to evaluate the quality and pollution of the 23 groups of groundwater sam-ples of 2014 in Shihezi area of Xinjiang. The results of groundwater quality assessment show that the groundwater quality is poor. The main in-fluence factors of phreatic water quality are pH and the oxygen consumption. The main influence factors of shallow confined water quality are pH,the oxygen consumption,total hardness,TDS,Al^3＋,SO4 ^2- ,TFe and Mn. The main influence factors of deep confined water quality are pH and the oxygen consumption. The confined water quality is inferior to the phreatic water quality because of the exploitation of mixed well. The results of groundwater pollution assessment show that the phreatic water pollution level is 1; the shallow confined water pollution level i-dentified as level 1-3 account for 75.0%,12.5% and 12.5% of the eight investigated wells respectively; the deep confined water pollution level identified as level 1-3 account for 40.0%, 20.0% and 40.0% of the ten investigated wells respectively; groundwater quality deterioration is mainly affected by the quality of surface water and the land use type in Shihezi area,while the influence of pollution sources has little effect.