摘要
该氨氮检测方法是对水杨酸分光光度法的改进,通过将50g/L的水杨酸改为150g/L的水杨酸钠,将有效氯为3.5g/L的次氯酸钠溶液改为5g/L的二氯异氰尿酸钠溶液,增加了检测试剂的稳定性和贮存时间,同时将氨氮测定上限从1mg/L提高至2.5mg/L,并将显色时间从60min优化为30min,使得此方法更为便捷。该方法的氨氮标准曲线线性关系良好,相关系数为0.9996,准确性和精密度高,加标回收率良好,适用于不同类型水质中氨氮的检测。
The method of ammonia nitrogen determination in this study is an improvement of the salicylic acid spectrophotometry. The stability and storage time of detection reagents were increased by substitute 150 g/L sodium salicylate for 50 g/L salicylic acid and 5 g/L sodium dichloroisocyanurate for sodium hypochlorite solution of 3.5 g/L available chlorine. Meanwhile,the upper limit of ammonia nitrogen detection was increased from 1 mg/L to 2.5 mg/L,and the color reaction time was optimized to 30 min from 60 min. Therefore,the improvement method is much more convenient than before. There was a good linearity for the standard curve equation of ammonia nitrogen,and the correlation coefficient was 0.9996. The method was of high accuracy and precision,and the standard recovery rate was good. The method might apply to ammonia nitrogen determination with different types of water quality.
作者
马芮
刘嘉骥
刘永
MA Rui;LIU Jiaji;LIU Yong(Sheng Shi Hui Ze Technology (Tianjin) Limited Company,Tianjin 300393,China)
出处
《中国环境监测》
CAS
CSCD
北大核心
2019年第5期160-164,共5页
Environmental Monitoring in China
关键词
氨氮
水杨酸钠
二氯异氰尿酸钠
便捷
ammonia nitrogen
sodium salicylate
dichloroisocyanurate
convenience
