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目的了解华北战区部队自备水源硝酸盐氮分布情况及其影响因素,保障部队饮水安全。方法 2013年1~10月采用普查的方法,对华北战区部队自备水源进行检测,检验项目包括《生活饮用水卫生标准》常规指标要求的微生物指标、感官性状和一般化学指标、毒理学指标,重点分析硝酸盐氮浓度情况。结果检测的396份自备水源水中硝酸盐氮最低值为0.01mg/L,最高值为98.36mg/L,均值为(9.07±1.30)mg/L。硝酸盐氮浓度符合国家生活饮用水标准的有264份,占67.50%(限值为10mg/L)。所调查地区中内蒙古地区硝酸盐含量最高,其浓度为(14.37±2.19)mg/L,明显高于北京、天津、河北、山西的检测值(P<0.01)。内蒙古地区自备水源硝酸盐氮合格率为38.90%,明显低于北京、天津、河北、山西(P<0.05)。井深不同的3个组,水中硝酸盐氮的含量及合格率有差异(P<0.01、P<0.05)。微生物指标超标组与微生物指标正常组比较,硝酸盐氮含量增加(P<0.01),合格率下降(P<0.05)。结论该部自备水源水硝酸盐氮浓度较高,内蒙古地区自备水源水硝酸盐污染较严重,深井水硝酸盐污染低于浅井水,细菌污染可能会导致硝酸盐含量增加。
Objective To understand the distribution of nitrate nitrogen and its influencing factors in the water sources supplied by units in North China Theater and ensure the drinking water safety of the units. Methods From January to October 2013, census-based methods were used to test the water resources owned by units in North China Theater. The test items included the microbial indicators, sensory traits and general chemical indicators as well as the toxicological indicators required by the routine indicators of “drinking water health standards” Focus on the analysis of nitrate nitrogen concentration. Results The lowest value of nitrate nitrogen in 396 self-supplied water samples was 0.01 mg / L and the highest value was 98.36 mg / L, with an average of (9.07 ± 1.30) mg / L. 264 nitrogenous nitrate concentrations in line with national drinking water standards, accounting for 67.50% (limit of 10mg / L). The content of nitrate in Inner Mongolia was the highest (14.37 ± 2.19) mg / L, which was significantly higher than that of Beijing, Tianjin, Hebei and Shanxi (P <0.01). The pass rate of nitrate nitrogen in self-provided water sources in Inner Mongolia was 38.90%, significantly lower than that in Beijing, Tianjin, Hebei and Shanxi (P <0.05). There were differences in the contents of nitrate nitrogen and the pass rate in three wells with different depths (P <0.01, P <0.05). Compared with the normal control group, the content of nitrate nitrogen increased (P <0.01) and the pass rate decreased (P <0.05). CONCLUSION Nitrate concentration in source water is higher in this area. Nitrate pollution in source water is more serious in Inner Mongolia. Nitrate pollution in deep wells is lower than that in shallow wells. Bacterial contamination may lead to an increase in nitrate content.