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2m*1/8甲烷柱测定大气中非甲烷总烃量
2m*1/8甲烷柱测定大气中非甲烷总烃量 详细信息：

名称：PQ甲烷柱
规格：2m*1/8，60-80目
编号：20220727007
zui高温度：250°C
应用：HJ2017环境空气，固定污染源废气，总烃，甲烷，非甲烷总烃的测定 气相色谱法

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。

2m*1/8甲烷柱测定大气中非甲烷总烃量  测试谱图：



2m*1/8 methane column to measure the total amount of non-methane hydrocarbons in the atmosphere
2m*1/8 methane column to measure the amount of non-methane total hydrocarbons in the atmosphere Details:

Name: PQ methane column
Specifications: 2m*1/8, 60-80 mesh
Number: 20220727007
Maximum temperature: 250°C
Application: Determination of HJ2017 ambient air, stationary pollution source waste gas, total hydrocarbons, methane, and non-methane total hydrocarbons by gas chromatography

Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. used direct injection differential gas chromatography to determine the amount of non-methane total hydrocarbons (NMHC). The effects of analytical conditions, gas sources and quantitative methods on the accuracy of NMHC quantification were investigated experimentally. Considering the lower baseline response and higher sensitivity, the appropriate hydrogen and air flow rates were selected, and the detection limit of the NMHC method was 0.03 mg/m3 (calculated as carbon), which could ensure the accuracy of low-concentration sample analysis. The experimental results show that the CH4 and C3H8 in the standard gas follow the carbon number response law, and their proportions will not affect the accuracy of quantification, and can be appropriately prepared according to the proportion 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. The standard gas with air as the bottom gas is used to quantify the air sample; during the determination of some samples, the total hydrocarbons have more than one peak, and the relevant conditions need to be adjusted before the determination.

2m*1/8 methane column to measure the total amount of non-methane hydrocarbons in the atmosphere Test spectrum: