动火分析中四种易燃易爆气体的同时测定

Simultaneous determination of the four kinds of inflammable and explosive gases in hot work analysis

目的建立气相色谱法同时测定动火作业区域内乙烯、丙烯、异丁烯、丁二烯四种易燃易爆气体的检测方法。方法乙烯、丙烯、异丁烯和丁二烯的空气样品于动火作业前用铝塑采气袋采集，经邻苯二甲酸二丁酯和β，β-氧二丙腈混合柱分离，以氢火焰离子化检测器检测，保留时间定性，峰高定量。结果乙烯、丙烯、异丁烯、丁二烯四种有害因素的检出限分别为0．3mg／m2、0．5mg／m2、1．5mg／m3、2．0mg／m3，标准曲线相关系数均为r=0．9999，相对标准偏差为1．4％～3．9％。结论通过色谱条件的选择、精密度试验、干扰试验、稳定性试验和现场试验，该方法适用于动火分析中乙烯、丙烯、异丁烯和丁二烯的同时测定。

Objective To establish gas chromatography for simultaneous determination of inflammable and explosive gases of ethylene, propylene, isohutylene, butadiene in hot work area. Methods Ethylene, propylene, isobutene and butadiene air samples were gathered with gas - bags made of aluminum foil before hot work, separated by the dibutyl phthalate and β,β-Oxydipropionitrile mixed column, detected by hydrogen flame ionization detector, with retention time for qualitative analysis and peak height for quantitative analysis. Results The detection limits of ethylene, propylene, isobutylene, butadiene were 0.3 mg/m3 , 0.5 mg/m3 , 1.5 mg/m3 , 2.0 mg/m3 , the standard curve correlation coefficient was r = 0. 9999, the relative standard deviation was 1.4% -3.9%. Conclusion According to the chromatographic condition selection, precision test, in- terference test, stability test and field trial, this method was suitable for the simultaneous determination of ethylene, propylene, isobutylene, butadiene in hot work analysis.