气相色谱法测定火药中异丙醇、乙酸乙酯和苯的含量

用气相色谱法对火药中异丙醇、乙酸乙酯和苯的含量进行测定。样品用甲醇提取,采用氢火焰检测器检测,检测器温度200℃,柱箱温度145℃,气化室温度190℃,载气为氮气,流速50 m L/min,外标法定量。该方法对异丙醇、乙酸乙酯和苯的最低检测浓度为0.5,0.3,0.6μg/m L;在5~100μg/m L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%~96.5%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,方法可用于火药中异丙醇、乙酸乙酯和苯含量的检测。

GC Determination of Isopropanol,Ethyl Acetate and Benzene in Propellant

Contents of isopropanol,ethyl acetate and benzene in propellant were determined by gas chromatography. The samples were extracted by methyl alcohol, detected by FID detector; respective temperatures of detector, column oven, vaporizer were 200℃, 145℃, 190℃. The carrier gas was nitrogen and its flow rate was 50 mL/min, the analytes were quantified with an external standard method. And the detection limits of isopropanol,ethyl acetate and benzene were 0.5 μg/mL ,0.3 μg/mL and 0.6 μg/mL,respectively. All of the target compounds exhibited good linearity （r＆gt;0.990） in the concentration range of 5~100 μg/mL. Values of recovery and RSD’s（n=6） found were in ranges of 94.8%~96.5% and 2.5%~3.6%,repectively, which accorded with the requirements of the quality of propellant determination. So the method can be used for detection of isopropanol,ethyl acetate and benzene in propellant.