纳米TATB中微量残阴离子含量的离子色谱分析

摘要

为评估纳米TATB产品质量,采用氧瓶燃烧法处理样品,用离子色谱测定吸收液中氯离子、硫酸根的方法来确定TATB中的微量组分含量.在Metrosep A Supp 7型阴离子分离柱上,以4.7 mmol·L -1Na2CO3溶液作为淋洗液,电导检测器进行检测.在优化的色谱条件下,样品中氯离子、硫酸根的方法检出限分别为0.0025 ug·mL-1,0.0032 ug·mL-1,线性范围分别为(0.5~3.0)ug·mL-1,(0.1~2.5)ug·mL-1,线性相关系数均大于0.9990.重复性测试(n=6)相对标准偏差分别为1.65%、2.28%,回收率分别为96.30%~103.73%,97.23%~100.91%.该方法具有操作简单快捷、无污染等优点,能满足纳米TATB中硫、氯的定量分析要求.%In order to assess the quality of nano-TATB, a simple and rapid method for the determination of Cl-and SO2-4 in the absorbent liquid by oxygen flask combustion-ionic chromatogram was developed to monitor the trace component of TATB.Na2CO3 solution with a concentration of 4.7 mmol·mL-1 was used as an eluate on an anion separation column of the model Metrosep A Supp 7 and conductivity detection.The method detection limits(MDL) of Cl-and SO2-4 were 0.0025 μg·mL-1 and 0.0032 μg·mL-1 respectively, under the optimized condition.The linear ranges of Cl-and SO2-4 were (500~3000) μg·L-1 and (100~2500) μg·L-1 respectively, and the correlation coefficients were all greater than 0.9990.The recoveries of the two analytes were 96.30%-103.73% and 97.23%-100.91% with the relative standard deviations(RSD,n=6) of 1.65%, 2.28%.The method has the advantage of simple operation, reagent-free and pollution-free, and can meet the quantitative analysis requirements of sulfur and chlorinous in nano-TATB.