摘要
用MgO控制预蒸馏水中的pH值，以硼酸溶液为吸收液，用稀硫酸进行中和滴定，用自动凯氏定氮仪测试水中的氨氮。检测下限为1mg／L，相对标准偏差在0．32％-1．04％范围内，加标回收率为96％-104％，并将该法与纳氏试剂比色法和离子色谱法进行了比较。
Ammonia nitrogen in water was determined by auto - kjeldahl unit, MgO was used as a regulator to control pH of sample in the predistillation. Boric acid solution was used as an absorbent, and vitriol standard solution was used as a titration reagent. The result of determination were compared with that of nessler method and IC method. The determination limit was 1 mg/L. The recovcries were 96% - 104% , and the RSD were 0.32% - 1.04%.
出处
《化学分析计量》
CAS
2007年第2期37-39,共3页
Chemical Analysis And Meterage
关键词
氨氮
凯氏定氮仪
中和滴定
PH值
ammonia nitrogen, Kjeldahl unit, neutralization titration
