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我厂以 NH4 NO3和 KCl为原料生产农用硝酸钾 ,NH4 Cl母液中 K+含量是该工艺主要检测项目之一。现将测定方法介绍如下。1 测定原理用甲醛消除试样中 NH4 +的干扰。在弱碱性介质中 ,试液中 K+与过量的四苯硼酸钠作用 ,生成稳定的四苯硼酸钾白色沉淀 ,剩余的四苯硼酸钠 ,在碱性介
Our factory takes NH4NO3 and KCl as raw materials to produce agricultural potassium nitrate, and K + content in NH4Cl mother liquor is one of the main test items of the process. Now the determination method is as follows. 1 Determination of formaldehyde with formaldehyde to eliminate the sample interference NH4 +. In a weak alkaline medium, K + in the test solution is reacted with an excessive amount of sodium tetraphenylborate to produce a stable white precipitate of potassium tetraphenylborate. The remaining sodium tetraphenylborate is treated in alkaline medium