2003-2018年广东省某市水源水中氨氮监测结果

The surveillance results of ammonia nitrogen in source water in a city of Guangdong Province from 2003 to 2018

目的了解广东省某市水源水中氨氮的污染水平,为水源水卫生管理提供科学依据。方法2003-2018年对广东省某市水源水氨氮的监测资料进行分析,按《地表水环境质量标准》(GB 3838-2002)Ⅲ类标准对氨氮进行评价,分析不同年份、水系和水期间的水源水中氨氮的水平。结果2003-2018年广东省某市水源水中氨氮的合格率为67.23%,合格率波动范围为23.81%~100.00%,且有上升趋势(χ^2=133.824,P<0.01),2011年后氨氮的合格率维持在90%以上。ZJ水系氨氮的合格率低于DJ、XJ、BJ和LXH水系(P<0.05),XJ和BJ水系氨氮的合格率高于DJ和LXH水系(P<0.05),ZJ、XJ、DJ、BJ和LXH水系的氨氮平均值分别为3.20、0.22、0.70、0.25和0.93 mg/L。仅发现ZJ水系枯水期氨氮的合格率低于丰水期(χ^2=4.706,P<0.05),其它水系在不同水期间氨氮的合格率差异无统计学意义。不同水期间氨氮的合格率(χ^2=0.950,P>0.05)和水平(F=2.153,P>0.05)差异均无统计学意义。结论2003-2018年广东省某市水源水中氨氮的污染状况逐渐变好,要重点加强对水源水的卫生监督管理和防护。

Objective To understand the pollution level of ammonia nitrogen in source water in a city of Guangdong Province and provide scientific basis for improving the sanitary management of source water.Methods The monitoring data of ammonia nitrogen in source water in a city of Guangdong Province from 2003 to 2018 were analyzed.And the level of ammonia nitrogen of source water in different years,water systems and water phaseswas evaluated according to the Standard of Surface Water Environmental Quality(GB 3838-2002).Results The qualification rate of ammonia nitrogen of source water in a city of Guangdong Province was 67.23%.And the rate fluctuated from 23.81%to 100.00%,and it had an increase trend(χ^2=133.824,P<0.01).The qualification rate of ammonia nitrogen maintained above 90%after 2011.The qualification rate of ammonia nitrogen of ZJ water system was lower than that of DJ,XJ,BJ and LXH water system(P<0.05),and the qualification rates of XJ and BJ water system were above DJ and LXH water systems(P<0.05).The mean values of ammonia nitrogen of ZJ,XJ,DJ,BJ and LXH water systems were 3.20,0.22,0.70,0.25 and 0.93 mg/L respectively.Only the qualification rate of ammonia nitrogen in the dry season of ZJ water system was lower than that in the wet season(χ^2=4.706,P<0.05).And there was no statistical significance in the difference of qualification rates in different water phases.And there was no statistical significance in the difference of qualification rate(χ^2=0.950,P>0.05)and the mean value(F=2.153,P>0.05)in different water phases.Conclusion The pollution situation of ammonia nitrogen in source water of this city in Guangdong Province was getting better.We should strengthen sanitation supervision,management and protection of source water.