名稱：GDX-502甲烷柱

規(guī)格：2m*3mm，60-80目

高溫度：250°C

編號：20221207002

名稱：硅烷化玻璃微球總烴柱

規(guī)格：2m*3mm，60-80目

使用溫度：250°C

編號：20221207001

應(yīng)用：安捷倫7820A，7890B
環(huán)境空氣，固定污染源廢氣中總烴，甲烷，非甲烷總烴的測定 氣相色譜法

浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司,研究了氧氣對空氣中甲烷、總烴分析時(shí)的干擾.得出,載氣的純度很高時(shí)使用GDX-502填充柱可以將甲烷峰和氧峰完全分離,甲烷和總烴和分析可不受氧峰干擾,氣樣中氧氣濃度低于17%時(shí)氧峰可忽略,低于12.5%時(shí)氧峰消失.氫火焰離子化檢測器不能檢出氧氣,氧峰僅為干擾峰,在一定的色譜條件下,干擾峰即氧峰和氣樣中的氧氣濃度成正比關(guān)系.當(dāng)氣樣中氧氣濃度小于28.7%時(shí),總烴值峰值等于甲烷測試時(shí)氧峰和各烴峰之和,當(dāng)氧氣濃度大于28.7%時(shí),不能用國標(biāo)氣相色譜法測試總烴,總烴值應(yīng)等于總烴峰值值減去該氣樣的氧值.

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: