利用气相色谱法-脉冲放电氦离子化检测器(PD-HID),结合阀切割技术,建立了测定原料乙烯和丙烯中痕量炔烃和二烯烃的方法.以原料乙烯和丙烯为研究对象,采用外标法,考察了该方法的精密度、回收率和检测限.结果表明:采用该方法,测定了标样中乙炔、丙二烯、丙炔和1,3-丁二烯4种组分的平均回收率均为92.15％～109.92％;5次重复测定结果的平均相对标准偏差均小于3.30％,表明该方法的准确度和精密度较高.标样中乙炔、丙二烯、丙炔和1,3-丁二烯的最低检测限依次为10,25,33,73 μL/m3,均低于GB/T 3391-2002,GB/T 3392-2003的检测结果.%A method for determination of the trace amounts of alkynes and alkadienes in ethylene and propylene was established by gas chromatography-pulsed discharge helium ionization detector with valve cutting technique.The precision,recovery rate and detection limit of this method was investigated by the external standard method for quantitation with ethylene and propylene as raw materials.The results showed that the average recovery rate of ethyne,allene,propyne and 1,3-butadiene in practical sample was all 92.15％-109.92％ by this method.The average relative standard deviation of test result repeating for 5 times was lower than 3.30％,and the method had the higher accuracy and precision.The detection limit of ethyne,a11ene,propyne and 1,3-butadiene was 10,25,33,73 μL/m3 respectively,and they were all lower than the results detected by GB/T 3391-2002,GB/T 3392-2003.
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