察布查尔县地区地下水水化学特征及地下水水质评价

Groundwater Hydrochemical Characteristics and Groundwater Quality Evaluation in Qapqal County Area

为查明察布查尔县地区的地下水水化学特征及地下水水质情况,选取2016年50组地下水水样测试数据,综合统计分析方法和水化学方法以及模糊综合评价法等方法,对察布查尔县地区地下水水化学特征及地下水水质进行研究。结果表明:察布查尔县地区地下水中Mg^2+、Ca^2+、HCO^-3离子含量较高。地下水水样pH为7.55~7.7,均值为7.63,地下水整体呈弱碱性,溶解性总固体(total dissolved solids,TDS)为103.8~1139 mg/L,均值为254.8 mg/L;地下水水化学类型以HCO3-Ca(Ca·Mg)和HCO3·SO4(SO4·HCO3)-Ca(Ca·Mg)型水为主。地下水的水化学特征主要受水岩作用控制,少部分浅埋区受蒸发作用影响,几乎不受大气降水的影响;经F值法和模糊综合评价法对察县地区进行地下水水质评价分析得知,该区域的地下水受污染程度轻,但也存在严重污染区域,在利用水资源的同时也要注意水资源的保护。

Toascertain the chemical characteristics and quality of groundwater in Qapqal County,NW China,50 sets of groundwater samples were sampled in 2016,and the chemical characteristics and quality of the groundwater were studied in comprehensive statistical analysis,hydrochemical method,and fuzzy comprehensive evaluation.The results show that the contents of Mg 2+,Ca 2+,and HCO-3 ions in the groundwater were high.The pH ranges 7.55~7.7,in average of 7.63.The groundwater is weakly alkaline,its total dissolved solids(TDS)value varies 103.8~1139 mg/L inaverage of 254.8 mg/L,and the type of the groundwater is mainly that of HCO 3·SO 4(SO 4·HCO 3)-Ca(Ca·Mg).The hydrochemical characteristics of groundwater are mainly controlled by water-rock interaction.Only a small part of shallow buried area is affected by evaporation and almost unaffected by atmospheric precipitation.Using F-value method and fuzzy comprehensive evaluation method,the groundwater quality is evaluated.The results show that the groundwater in the county was unpolluted in overall,exclusive of few spots.Attention should be paid to the protection of water resources.