摘要
目的了解北京市朝阳区自备井水"三氮"浓度及其变化,为防治氮污染提供科学依据。方法收集整理2013—2017年北京市朝阳区自备井水主动监测数据并进行统计分析。结果 2013—2017年北京市朝阳区共监测自备井水760件,氨氮、亚硝酸盐氮和硝酸盐氮检测浓度的中位数分别为0.03、0.001 5和1.73 mg/L;检出率分别为56.58%、10.79%和85.66%;合格率分别为100.00%、100.00%和92.89%。氨氮、亚硝酸盐氮和硝酸盐氮的各年检测浓度差异均有统计学意义(均P<0.05),其中氨氮检测浓度逐渐降低,硝酸盐氮2014年较2013年有明显下降,自2015年开始检测浓度中位数趋于稳定。枯水期氨氮的检测浓度和检出率均高于丰水期(均P<0.05)。出厂水和末梢水中"三氮"的检测浓度、检出率和合格率差异均无统计学意义(均P>0.05)。结论 2013—2017年朝阳区自备井水氨氮检测浓度呈下降趋势,亚硝酸盐氮检出率最低,硝酸盐氮是主要的超标项目。
[Objective]To understand the concentration and changes of ammonia nitrogen,nitrite nitrogen and nitrate nitrogen in well water in Chaoyang District of Beijing,and provide scientific basis for the prevention and control of nitrogen pollution.[Methods]The active monitoring data of well water in Chaoyang District of Beijing from 2013-2017 were collected and analyzed.[Results] A total of 760 well water samples were monitored in Chaoyang District from 2013-2017. The median concentration of ammonia nitrogen,nitrite nitrogen and nitrate nitrogen were 0.03,0.0015 and 1.73 mg/L,the detection rates were 56.58%,10.79%and 85.66%,and the qualified rates were 100.00%,100.00% and 92.89%. The differences of annual detection concentration of ammonia nitrogen,nitrite nitrogen and nitrate nitrogen were all statistically different（all P〈0.05）. The concentration of ammonia nitrogen was gradually reduced. The concentration of nitrate nitrogen in 2014 was significantly lower than that in 2013,and the median concentration of nitrate nitrogen began to stabilize since 2015. The concentration and detection rate of ammonia nitrogen in dry season were all higher than those in rainy season（all P〈0.05）. There were no significant differences in the concentration,detection rate and qualified rate of ＂three nitrogen＂ in finished water and peripheral water（all P〉0.05）. [Conclusion]From2013-2017,the concentration of ammonia nitrogen in well water in Chaoyang District declined,the detection rate of nitrite nitrogen was the lowest,and nitrate nitrogen was the main index which exceeded the standard.
作者
赵艳玲
张美云
郭春城
吕鸥
王富嵩
ZHA;ZHANG Mei-yun;GUO Chun-cheng;LYU Ou;WANG Fu-song(Department of Environmental Hygiene, Chaoyang Center for Disease Control and Prevention,Beijing, 100021 China)
出处
《职业与健康》
CAS
2018年第11期1528-1530,1534,共4页
Occupation and Health
关键词
氨氮
亚硝酸盐氮
硝酸盐氮
自备井水
Ammonia nitrogen
Nitrite nitrogen
Nitrate nitrogen
Well water
