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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 ,可获得良好效果
The method for determination of NH + 4 in ethanol extract by indophenol blue colorimetric method was improved. The results showed that when the mass concentration of NH + 4 - N in the colorimetric solution was 0. 05 ~ 3 mg / L, 95% ethanol volume of the same 0 .1 g / L sodium nitroprusside catalyst, you can get good results