电导滴定法测定氮肥中NH_4^+—N含量

Determining the Content of Ammoniacal Nitrogen in Nitrogenous Fertilizer by Conductometric Titration

电导滴定法测定氮肥中NH+4—N含量 ,是以NH+4与OH 定量反应为基础 ,用NaOH标准溶液为滴定剂 .在NH+4浓度为 5.0 0× 1 0 - 4 ～ 1 .0 0× 1 0 - 2 mol·L- 1范围内 ,该法与国标方法相比较 ,测定结果十分接近 ;方法误差小于 4.62 %,相对标准偏差在 2 .48%～3.0 7%之间 .本方法对氮肥中NH+4—N的回收率为 88.76%～ 1 0 3.2 7%.方法简便、快速、准确、重现性好 .

With conductometric titration the anther determined the content of ammoniacal nitrogen in nitrogenous ion and the hydroxyl ion,with the sodium hydroxide standard solution as the titrant. And when concentration of the ammonium ion was from 5.00×10 -4 mol/L to 1.00×10 -1 mol/L,the determination result by this method compared with the method by GB was satisfactory Error of the method was less between 2.48%～3.07%.Recoveries of the ammoniacal nitrogen in nitrogenous fertilizer by the method was 88.76%～103.27%.The method was simple、rapid、accurate and precise.