电位滴定法测定三聚磷酸钠含量

Determination of STPP Content byPotentiometric Method

该法采用三氭三（乙二胺）钴作为沉淀剂，以亚铁氰化钾作为滴定剂，用电位滴定法间接测定三聚磷酸钠的含量。该方法测定过程不超过30分钟，标准偏差在0.10～0.12％之间，可满足生产控制之用。

Abstract, The content of STPP were deteiminated indirectly by potentiometric titration with coalt trichlortri, ethy lenediamine)as precipitator, and potassium ferrocyanlde as iitrator.This method is raster(<30min.), the standard deviation lie in between 0.10?.12%