非水溶剂电位滴定法测定标准物质RDX和HMX的含量

Determination of Standard Value of RDX and HMX Content by Electrode Potential Titration in Non-aqueous Solvent

建立了在非水溶剂中电位滴定测定纯度标准物质RDX和HMX含量的方法，通过实验对非水溶剂、滴定剂种类、滴定剂浓度、滴定终点进行了选择。通过实验确定了溶剂为二甲基亚砜（DMSO），滴定剂为甲醇钠（CH3ONa），滴定剂浓度为0．30mol／L，终点为电位曲线的等当点，实验用电位滴定曲线准确确定了滴定终点。通过18次测定，测得RDX的纯度为99．554％～99．865％，精密度为0．0976％。测得HMX的纯度为99．565％～99．888％，精密度为0．10％。该法简便、可靠。

A method to determine the content of hexahydro- 1,3,5-trinitro s-triazine （RDX） and hexahydro 1 ; 3,5, 7-tetronitro-s-terazine（HMX） by electrode potential titration in non aqueous solvent was established. The factors of affecting the experiment,such as non aqueous solvent, titrant, concentration of titrant, endpoint of electrode potential, were determined. The optimal electrode potential titration conditions obtained were dimethylsulfoxide （DMSO） as non-aqueous solvent; sodoum mothoxide（CH3ONa） as titrant; CHaONa concentration, 0.30mol/L; EQP of electrode potential titration curve as endpoint. The purity of RDX obtained by eighteen times of measurements is 99. 554% to 99. 865% with the relative standard deriation （RSD） of 0. 0976%. The purity of HMX is 99. 565% to 99. 888%,the value of RSD is 0. 10%. The method is facile and dependable.