地下水是新疆天山北坡平原区生活用水、工业用水及灌溉用水的主要水源。依据2011 年77 个地下水样的 pH 值、总溶解固体( TDS) 、总硬度、氨氮、NO2 - 、NO3 - 、高锰酸盐指数、F- 、Cl- 、SO4 2- 检测结果, 采用单项指标评 价法进行地下水质量评价, 统计了各地各评价指标在不同水质级别所占的比例; 采用化学组分浓度对比法对同一监 测井2003 年和2011 年的18 组水样进行地下水污染评价, 分析了水质变化趋势和地下水污染原因。结果表明: 2011 年潜水和承压水中? 类和? 类水质所占比例之和分别为40. 0% 和47. 6%; 潜水水质类别基本呈现变好的趋 势, 而承压水水质类别呈现变差趋势。

Gr oundw ater is o ne o f t he impor tant w ater sour ces of domestic water , industr y w ater, and ir rig atio n w ater in the pla in area of nor thern slope of T ianshan Mountains in Xinjiang . Based on the pH, T DS, to tal har dness, ammo nia, NO2 - , NO3 - , per2 manganate index , F- , Cl- , and SO4 2- values of 77 g ro undw ater samples in 2011, t he sing le factor metho d w as used to evaluat e gr oundwat er quality and ca lculate the pr opor tions of each ev aluatio n index in different g ro undwater qualit y lev els. Gro undw ater po llution w as assessed based on 18 g ro undw ater samples o f the same observ ation well in 2003 and 2011 using the chem ical com2 ponent co ncentrat ion compariso n metho d, and the v ariat ion t rend of gr oundw ater quality and causes o f g ro undwater pollutio n wer e analyzed. The results showed that gr oundw ater w ith quality level of ? and ? in the unco nf ined and co nfined aquifers ac2 counts for 40. 0% and 47. 6% in 2011, and the water qua lity of unconfined aquifer impro ves w hile the wat er quality of confined aquifer deteriorates.

中国地质调查局项目( 1212011220982) ; 新疆自治区水文学及水资源重点学科基金( xjsw szyzdxk 20101202)