硅烷化玻璃微球总烃柱 氧气对空气中甲烷、总烃分析的干扰gdx502柱

名称：GDX-502甲烷柱

规格：2m*3mm，60-80目

高温度：250°C

编号：20221207002

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,研究了氧气对空气中甲烷、总烃分析时的干扰.得出,载气的纯度很高时使用GDX-502填充柱可以将甲烷峰和氧峰完全分离,甲烷和总烃和分析可不受氧峰干扰,气样中氧气浓度低于17%时氧峰可忽略,低于12.5%时氧峰消失.氢火焰离子化检测器不能检出氧气,氧峰仅为干扰峰,在一定的色谱条件下,干扰峰即氧峰和气样中的氧气浓度成正比关系.当气样中氧气浓度小于28.7%时,总烃值峰值等于甲烷测试时氧峰和各烃峰之和,当氧气浓度大于28.7%时,不能用国标气相色谱法测试总烃,总烃值应等于总烃峰值值减去该气样的氧值.

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: