气相色谱法测定火药中丙酮、乙醚的含量

用气相色谱法对火药中丙酮、乙醚的含量进行测定。样品用丁酮-仲丁醇混合溶液提取,采用热导检测器检测,检测器温度200℃,柱箱温度135℃,气化室温度190℃,载气为氢气,流速50 mL/min,外标法定量。该方法对丙酮、乙醚的最低检测浓度为0.5,0.3μg/mL;在5~100μg/mL浓度范围内均呈良好的线性关系,线性系数r0.990;方法回收率在94.8%~95.5%之间,相对标准偏差(n=6)在2.5%~3.6%之间。符合火药质量检测的要求,方法可用于火药中丙酮、乙醚含量的检测。

GC Determination of Acetone and Ether in Propellant

Contents of acetone and ether in propellant were determined by gas chromatography. The samples were extracted by the mixture of methyl ethyl ketone and 2-butyl alcohol, then detected by TCD detector, the respective temperature of detector, column oven, vaporizer was 200, 135, 190 ℃. The carrier gas was hydrogen and its flow rate was 50 mL/min,the analytes were quantified with an external standard method. And the detection limits of acetone and ether were 0.5μg/mL and 0.3μg/mL respectively. All of the target compounds exhibited good linearity （r〉0.990） over a concentration range of 5~100μg/mL.Values of recovery and RSD （n=6） were in ranges of 94.8%~95.5%and 2.5%~3.6%respectively, which accorded with the requirements of the quality of propellant determination, and it can be used for detection of acetone and ether in propellant.