气相色谱法测定非甲烷总烃的研究

Study of the Determination of Non - methane Hydrocarbons by Gas Chromatography

用玻璃注射器(气袋)采集气体样品,以双柱单氢火焰离子化检测器的气相色谱仪直接进行测定。进样1.0 mL样品分别进入汽化室的总烃柱和甲烷柱中,由于这两个柱子填充材料和长短差异,总烃先在FID上产生响应,然后甲烷在FID上产生响应。总烃的浓度扣除甲烷浓度和除烃空气氧的浓度值,即可得到非甲烷总烃(NMHC)的浓度,可以实现单次进样,同时完成总烃、甲烷、非甲烷总烃浓度的测定。文章研究1.37～22.3 mg/m3浓度甲烷标准气,得出甲烷标准曲线方程为Y=715X+829,r=0.9990,相对标准偏差为0.26%～1.8%,总烃标准曲线方程Y=695X+724,相对标准偏差为0.35%～1.4%,除烃空气(O2-N2,20.8%)相对标准偏差为0.75%。该法用于环境空气和固定污染源有组织排放中NMHC含量分析,操作简单,实验结果满意。

Using glass syringe （ gas bag） collection of samples, which directly determined samples by gas chromatog- raphy equipped with a hydrogen flame ionization detector and double columns. Injection of 1.0 mL sample into the vapori- zer, respectively in total hydrocarbon column and methane column, due to the differences in the two pillars fill material and length, total hydrocarbon was produced in the FID signal first, and then the methane. Deducted from total hydrocar- bon concentrations of methane and hydrocarbon oxygen, the concentrations of non methane hydrocarbon （NMHC） meth- ane were got, and a single sample acquired the concentrations of total hydrocarbon, methane, and NMHC. The scope of 1.37 -22. 3 mg/m^3 standard methane gas was researched, methane standard curve equation for Y = 715x ＋ 829 and r = 0. 9990 were obtained, the relative standard deviation was 0. 26% - 1.8% , total hydrocarbon standard curve equation for Y = 695X ＋ 724, the relative standard deviation was 0. 35% - 1.4% , and hydrocarbon - free air （ 02 - N2,20. 8% ） rel- ative standard deviation was 0.75 %. The method was used in analysis of NMHC in ambient air and stationary sources emission, the operation was simple and the experimental results were satisfied.