关于工业三氯化磷中游离磷分析方法的研究

Study on Analytical Method of Free Phosphorus in Industrial Phosphorus Trichloride

HG/T2970-2009 《工业用三氯化磷》规定了游离磷的分析方法中,不同型号乳化剂之间的乳化性能和颜色差异较大,每次试验都需要做标准溶液工作曲线。以无水甲醇代替乳化剂,同样可以使析出的银均匀分散在苯-甲醇-水体系中,在520 nm波长下比色测定游离磷的含量。此方法所用甲醇为实验室常用试剂,空白值较小,更利于测定低含量的游离磷。

HG/T2970-2009 Phosphorus Trichloride for Industrial Use provides for the analysis of free phosphorus.The emulsifying properties and colors of different types of emulsifiers differ greatly.A standard solution working curve is required for each test.Replacing emulsifier with anhydrous methanol,the precipitated silver can also be uniformly dispersed in the benzene-methanol-water system.The content of free phosphorus is determined by colorimetric method at 520 nm wavelength.The methanol used in this method is a common reagent in laboratory.The blank value is small,it is more favorable for the determination of free phosphorus in low content.