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目的研究北京市农村地下水溴化物分布特征,分析其可能的来源和成因以指导饮水消毒工作,预防含溴消毒副产物的形成。方法分层选取远郊区县农村集中式供水进行调查,采用美国Dionex ICS-3000型离子色谱仪进行实验室检测。结果抽取农村集中式供水单位504个,占全部农村供水单位的12.8%,水源水溴化物浓度检测范围从0.001～0.46 mg/L,均数为0.037 mg/L,溴化物较高地区集中在房山、大兴、通州。经过配对t检验,枯、丰水期水源水溴化物浓度差异有统计学意义(t=2.442,P<0.05),丰水期高于枯水期。结论北京地区农村集中式供水溴化物浓度呈现明显地区聚集性,高溴化物地区应注意选择合理的消毒方式,预防含溴消毒副产物的形成。
Objective To study the distribution characteristics of groundwater bromide in rural areas of Beijing and analyze its possible sources and causes to guide the disinfection of drinking water and prevent the formation of brominated disinfection by-products. Methods The water supply in rural areas in suburbs and counties was stratified and stratified for the investigation. The laboratory tests were carried out by the American Dionex ICS-3000 Ion Chromatograph. Results A total of 504 centralized water supply units were collected in rural areas, accounting for 12.8% of all rural water supply units. The detection range of bromide concentrations in water sources was 0.001-0.46 mg / L, with a mean of 0.037 mg / L. The higher bromide concentrations were concentrated in Fangshan Daxing, Tongzhou. After paired t test, there was a significant difference in the concentration of bromide in water source during the dry and wet periods (t = 2.442, P <0.05), and higher in wet season than in dry season. Conclusion Concentration of concentration of bromide in centralized water supply in rural areas of Beijing shows obvious agglomeration. High bromide area should pay attention to choose proper disinfection method to prevent the formation of brominated disinfection by-products.