MS-5 Å填充柱 气相色谱法测定大气和废气中非甲烷总烃

气相色谱法测定大气和废气中非甲烷总烃，液化石油气，二甲醚，甲缩醛，乙缩醛，乙醇，室内空气，焦炉煤气，炼厂气，乙酸乙酯，医疗器械，环氧乙烷，过氧化物，苯系物，增塑剂，氨

气相色谱法测定大气和废气中非甲烷总烃
气相色谱法测定大气和废气中非甲烷总烃 详细信息：

名称：填充柱
规格：1m*1/8
型号：5Å

非甲烷总烃(NMHC)通常是指除甲烷以外的所有可挥发的碳氢化合物(其中主要是C2-C8)的总称.一般环境空气中非甲烷总烃的含量不高,但随着近年工业的发展,大量废气排入环境空气中.大气中的非甲烷总烃超过一定浓度,除直接对人体健康有害外,在一定条件下经日光照射还能产生光化学烟雾,对环境和人类造成危害.

浩瀚色谱（山东）应用技术开发有限公司用直接进样差量气相色谱法测定非甲烷总烃(NMHC)量。实验研究了分析条件、气源和定量方式等对NMHC定量准确度的影响。综合考虑较低基线响应和较高灵敏度等,选择合适的氢气和空气流速,测得NMHC方法检出限为0.03 mg/m3(以碳计),该法可低浓度样品分析的准确度。实验结果表明,标准气中CH4和C3H8遵从碳数响应规律,其配比不会影响定量的准确性,可根据样品总烃和甲烷比例适当配制;对于低浓度样品,以空气为底气的总烃响应灵敏度低于氮气为底气的总烃响应灵敏度,采用以氮气为底气的标准气来定量空气中总烃的含量时,测定结果将产生较大偏差,甚可能产生负值,应该用以除烃空气为底气的标准气来定量空气样品;某些样品测定过程中,总烃不只出一个峰,需要调节相关条件再进行测定。

气相色谱法测定大气和废气中非甲烷总烃  测试谱图：



Determination of non-methane total hydrocarbons in air and waste gas by gas chromatography
Determination of non-methane total hydrocarbons in the atmosphere and exhaust gas by gas chromatography. Details:

Name: Packed column
Specification: 1m*1/8
Model: 5Å

Non-methane total hydrocarbons (NMHC) usually refers to all volatile hydrocarbons (mainly C2-C8) except methane. Generally, the content of non-methane total hydrocarbons in ambient air is not high, but with the recent industrial With the development of the environment, a large amount of exhaust gas is discharged into the ambient air. The non-methane total hydrocarbons in the atmosphere exceed a certain concentration. In addition to being directly harmful to human health, under certain conditions, sunlight can also produce photochemical smog, which is harmful to the environment and humans.

Haohan Chromatography (Shandong) Applied Technology Development Co., Ltd. uses direct injection differential gas chromatography to determine the amount of non-methane total hydrocarbons (NMHC). The experiment studied the influence of analysis conditions, gas source and quantification method on the accuracy of NMHC quantification. Considering the lower baseline response and higher sensitivity, choosing appropriate hydrogen and air flow rates, the detection limit of the NMHC method is 0.03 mg/m3 (calculated as carbon). This method can ensure the accuracy of the analysis of low-concentration samples. The experimental results show that CH4 and C3H8 in the standard gas follow the carbon number response law, and their ratio will not affect the accuracy of quantification. They can be appropriately prepared according to the ratio of total hydrocarbons and methane in the sample; for low-concentration samples, the total hydrocarbons with air as the bottom gas The response sensitivity is lower than the response sensitivity of total hydrocarbons with nitrogen as the bottom gas. When the standard gas with nitrogen as the bottom gas is used to quantify the content of total hydrocarbons in the air, the measurement results will have a large deviation, and may even produce negative values. It should be used to remove hydrocarbons. Air is the standard gas of the bottom gas to quantify the air sample; in the determination process of some samples, the total hydrocarbon does not only show a peak, and the relevant conditions need to be adjusted before the determination.

Determination of non-methane total hydrocarbons in the atmosphere and exhaust gas by gas chromatography Test spectrum: