摘要
离子型稀土矿在生产过程中会产生较多高浓度氨氮溶液,常用的纳氏试剂光度法和水杨酸-次氯酸盐光度法测量需将溶液反复稀释到测量范围,产生较大误差。本文采用甲醛法测量高浓度氨氮[1],铵根离子与甲醛溶液反应能快速的生成酸,根据消耗的氢氧化钠溶液的量计算氨氮的含量,对比3种方法的准确度和精密度。结果表明:测量高浓度的氨氮溶液,使用传统的分光光度计测量需将待测液反复稀释多次,误差高达20%。推荐采用甲醛法,操作简便快速,也避免了使用分光光度计测量需要稀释多倍造成的误差。
The extracting of ionic rare earth will produce plenty of solution with high concentration ammonia-ntrogen,it need dilute many times until the concentration of mother liquids are in the test range with usual determination methods,such as Nessler-reagent spectrophotometric method and Salicylic acid-pypocholoride spectrophotometric method,which will bring big errors in the testing procedure. In this study,a method for the determination of high concentration ammonia-ntrogen was studied,which was based on the principle that NH+4reacted with formaldehyde could release acid. Using sodium hydroxide solution titrated the reacted liquid,then calculated the concentration of ammonia-ntrogen. The paper discussed the accuracy and precision of three test methods. Results showed that,it would bring big errors to use the spectrophotometer to determine high concentration ammonia-ntrogen,and the measured solution need to be dilute many times. The paper advised that using the formaldehyde method to determinate the concentration was easy and fast,and the method could avoid big errors brought by diluting many times.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第S1期184-186,共3页
Environmental Engineering
关键词
高浓度氨氮
纳氏试剂光度法
水杨酸-次氯酸盐法
甲醛法
high concentration ammonia-ntrogen
nessler-reagent spectrophotometric method
salicylic acid-pypocholoride spectrophotometric method
formaldehyde method
