气相色谱法测定黑色PMMA燃烧产物中的一氧化碳和二氧化碳含量

利用气相色谱法检测黑色PMMA完全燃烧烟气中的常量二氧化碳和微量一氧化碳,建立了双气路双检测器的检测方法。恒定色谱柱温度,通过定量管进样,Poropak T色谱柱预分离后,采用阀切换及柱反吹技术使不同组分分别流入5A分子筛色谱柱和Poropak N色谱柱中。5A分子筛色谱柱用于分离一氧化碳,经Ni催化甲烷化转化后用FID检测器测定;Poropak N色谱柱分离二氧化碳后进入电导检测器测定。采用峰面积法建立标准曲线,一氧化碳和二氧化碳的线性相关系数分别为0.999 9和0.999 6。用该法测定标准气体,其测定值与标准值的相对误差小于2%,测定结果的相对标准偏差小于1%。该方法可用于烟气毒性的分析。

Determination of Carbon Monoxide and Carbon Dioxide in Combustion Product of Black PMMA by Gas Chromatography

In the determination of micro carbon monoxide and macro carbon dioxide in the combustion product of black PMMA by gas chromatography,double gas path and double detectors testing method were established. Chromatographic column temperature was constant in the process of analysis. The gas was pre-separated by Porapak T column using loop for sample injection. Different components flowed into 5A molecular sieve column and Porapak N column by valve switching and column back flushing technology. CO was separated by 5A molecular sieve column and detected by FID detector after methanation with the catalysis of Ni;CO2 was separated by Porapak N column and detected by TCD detector. The standard curve with excellent linear relationship was determined by the peak area. The linear correlation coefficient was 0.999 9 and 0.999 6 for CO and CO2,respectively. Determination of the standard gas by this method,its relative error was less than 2%. The relative standard deviation of determination results was less than 1%（n=5）. The method is suitable for the test of smoke toxicity.