氨氮水杨酸分光光度测定法的改进

摘要

水中氨氮浓度是反映水质状况的重要参数.对环境标准(HJ 536-2009)中氨氮测定方法进行改进.结果表明,改进后的方法显色反应仅需5 min,比环境标准快12倍;氨氮检测的线性范围为0.01~5.0 mg·L-1,检出限为0.007 mg·L-1,均优于环境标准.对自来水中氨氮进行分析,加标回收率为98.2%~103.4%,表明改进后的方法适用于水样中氨氮的检测.%The concentration of ammonia nitrogen in water is an important parameter of water quality.We improved the determination method of ammonia nitrogen in the environmental standard(HJ 536-2009).The results showed that color reaction only took 5 min,which was 12 times faster than that of the environmental standard.In addition,the linear range was from 0.01 mg·L-1to 5.0 mg·L-1,and the detection limit was 0.007 mg·L-1,which were better than those of the environmental standard.We analyzed ammonia nitrogen in tap water samples,and the adding standard recovery was 98.2%~103.4%,which indicated that the improved method was suitable for the determination of ammonia nitrogen in real water samples.