用高效液相色谱法测定包覆火药中２，４－二硝基甲苯含量，样品用甲醇超声提取，在ＬｉｃｈｒｏｓｏｒｂＲＰ－１８，５μｍ柱上进行分析流动相甲醇－水（６０：４０Ｖ／Ｖ），检测波长２５４ｎｍ，方法的平均回收率９９．３％，相对标准偏差１．０％．关于迁移速率常数的估算，在恒温烘箱中，使包覆火药中２，４－二硝基甲苯加速向单基药膜扩散，间隔不同时间取出，测定其含量，进而按动力学方法得出常温（２５℃）下包覆火药中２，４－二硝基甲苯的迁移速率常数为１．４７×１０－９ｍ２／ｓ． The content of 2,4-dinitrotoluene in the coated gunpowder was determined by high performance liquid chromatography (HPLC). The sample was extracted with methanol and analyzed by mobile phase methanol-water (60:40 V / V) on Lichrosorb RP- The detection wavelength was 254nm. The average recovery of the method was 99.3% with relative standard deviation of 1.0%. For the estimation of the transfer rate constant, 2,4-dinitrotoluene in the coated gunpowder is accelerated to diffuse into the monobasic film in a constant temperature oven at different intervals and the content thereof is measured. Then, the kinetic method is used to obtain the normal temperature (25 ℃) coated gunpowder 2,4-dinitrotoluene migration rate constant of 1.47 × 10-9m2 / s.