硅烷化玻璃微球总烃柱 气相色谱法测定大气中非甲烷总烃量

名称：硅烷化玻璃微球总烃柱

规格：2m*3mm，60-80目

使用温度：250°C

编号：20221207001

应用：安捷伦7820A，7890B
环境空气，固定污染源废气中总烃，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。

Determination of total non methane hydrocarbons in atmosphere by gas chromatography

Details of determination of total non methane hydrocarbons in the atmosphere by gas chromatography:






Name: Silanized glass microsphere total hydrocarbon column



Specification: 2m * 3mm, 60-80 meshes



Operating temperature: 250 ° C



No.: 20221207001



Application: Agilent 7820A, 7890B

Determination of total hydrocarbon, methane and non methane total hydrocarbon in ambient air and waste gas from fixed pollution sources Gas chromatography








Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. uses direct injection differential gas chromatography to determine the amount of non methane total hydrocarbons (NMHC). The effects of analysis conditions, gas sources and quantitative methods on the quantitative accuracy of NMHC were experimentally studied. Considering the lower baseline response and higher sensitivity, appropriate hydrogen and air flow rates were selected, and the detection limit of NMHC method was 0.03 mg/m3 (measured in carbon), which can ensure the accuracy of low concentration sample analysis. 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, so they can be properly prepared according to the proportion of total hydrocarbon and methane in the sample; For low concentration samples, the response sensitivity of total hydrocarbon with air as the base gas is lower than that of total hydrocarbon with nitrogen as the base gas. When the standard gas with nitrogen as the base gas is used to quantify the content of total hydrocarbon in the air, the measurement results will have a large deviation, or even a negative value. Therefore, the standard gas with hydrocarbon free air as the base gas should be used to quantify the air sample; During the determination of some samples, the total hydrocarbon has more than one peak, which needs to be determined after adjusting the relevant conditions.










Test spectrogram for determination of total non methane hydrocarbons in the atmosphere by gas chromatography: