库仑滴定法测定有机硅样品中的氮含量

Determination of the Amount of Nitrogen in Organosilicon Samples by Coulometric Titration

本文利用库仑滴定法研究了高分子和低分子硅氮化合物及含氮有机硅样品中氮含量的测定,并研究和讨论了影响测定结果准确性的因素。

A method for determining the amount of nitrogen in high or low molecular weight silicon-nitrogen compounds and silicone rubber containing silicon-nitrogen compounds by coulometric titration was described. Organosilicon sample was decomposed in 1 mol/L H2SO4 for at least 2 h. Then,the sample solution containing NH7 was accurately titrated in the buffer solution of 0. 075 mol/L Na2B4O7-1- 5 mol/L KBr. The sensitivity and precision of the titration were higher than those of the current elemental analysis. The factor influencing the accuracy of result was also investigated.