对靛酚兰比色法测定乙醇样品中NH_4^+的改进

Improvement of the indophenol blue colourimetric method for determination of NH + 4 in ethyl alcohol

对靛酚兰比色法测定乙醇浸提液中 NH+ 4 的方法进行了改进 ,结果表明 ,比色液中 NH+ 4 - N的质量浓度为 0 .0 5～ 3mg/L时 ,使用与体积分数为 95%的乙醇体积相同的 0 .1 g/L硝普钠溶液催化剂 。

NH + 4 concentration in ethyl alcohol can be determined by improved indophenol blue colorimetric method,with which when NH + 4-N concentration range is between 0.05-3 mg/L,and the 0.1 g/L sodium nitropyusside is used as catalyst,its volume is equal to that of 95% ethyl alcohol in determining solution.