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目的 了解广州市市政水厂水源水的污染现状.方法 于2007-2015年对广州市市政水厂水源(珠江、北江、东江和西江)水中的氨氮、硝酸盐和高锰酸盐指数进行检测并分析变化规律以及相关性.结果 与珠江比较,北江、东江、西江水样中高锰酸盐指数和氨氮的合格率均较高(P＜0.05);而硝酸盐均合格且无明显差异.珠江水样的氨氮合格率随着年份的增加有下降趋势(P=0.050);东江水样的氨氮合格率随着年份的增加有上升趋势(P＜0.05).珠江、东江和西江水样中的高锰酸盐指数与氨氮均呈正相关(P＜0.05);东江和西江水样中的高锰酸盐指数与硝酸盐均呈负相关(P＜0.05);珠江、北江、东江和西江水样中氨氮与硝酸盐均无统计学相关性(P＞0.05).结论 市政水厂水源由珠江水更换为西江水后,高锰酸盐指数和氨氮的合格率明显提高,水质得到了很大的改善.珠江受有机物污染的程度相对较重,应重点加强水源防护.“,”Objective To understand the pollution situation in the source water of Guangzhou municipal water plant.Methods The levels of ammonia nitrogen(NH3-N),nitrates(NO3-N) and permanganate index(CODMn) in the source water of Guangzhou municipal water works (Zhujiang River,Beijiang River,Dongjiang River and Xijiang River) were determined during 2007-2015.Results Compared with Zhujiang River,the qualified rate of CODMn and NH3-N in other three rivers were apparently higher (P＜0.05).However,there was no significant difference in NO3-N,which was all qualified.The qualified rate of NH3-N in Zhujiang River showed a significant decreased trend with the increase of year (P=0.050).However,the qualified rate of NH3-N in Dongjiang River showed a significant increased trend with the increase of year (P＜0.05).A positive correlation was found between CODMn and NH3-N in Zhujiang River,Dongjiang River and Xijiang River (P＜0.05).CODMn had obviously negative correlation with NO3-N in Dongjiang River and Xijiang River(P＜0.05).No associations between NH3-N and NO3-N in Zhujiang River,Beijiang River,Dongjiang River and Xijiang River were found (P＞0.05).Conclusion After replacement of source water (Zhujiang River) by Xijiang River,the qualified rates of CODMn and NH3-N are both obviously increased.Zhujiang River presents more serious organic pollution,the protection of water sources should be strengthened.