摘要
在试验的基础上对镉柱还原法测定硝酸盐氮的一些不足之处进行了改进 ,使精密度、准确度和还原效率得到提高 。
It is reported that cadmium granules of sizes between 0.42～0.25mm should be activated by a treatment of removing the oxide film on the surface with diluted hydrochloric acid and then reacted with a 20g·L -1 solution of copper sulfate. The pretreated cadmium granules are filled into the reduction column as described and the column is eluted with a diluted solution of NH 4Cl EDTA keeping the cadmium granule to be under the solution level, thus preventing the entering of air into the column. By this modification, the reduction efficiency is remarkably improved, and better accuracy and precision in the determination of nitrate nitrogen are obtained. Furthermore the concentration range of determination is broadened to 0.01～0.6mg·L -1 .
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2001年第11期497-498,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
镉柱还原法
硝酸盐氮
改进
测定
还原效率
光度法
Cadmium reduction column
Nitrate nitrogen
Modification of reduction conditions
