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）應用技術開發(fā)有限公司,用直接進樣差量氣相色譜法測定非甲烷總烴(NMHC)量。實驗研究了分析條件、氣源和定量方式等對NMHC定量準確度的影響。綜合考慮較低基線響應和較高靈敏度等,選擇合適的氫氣和空氣流速,測得NMHC方法檢出限為0.03 mg/m3(以碳計),該法可低濃度樣品分析的準確度。實驗結果表明,標準氣中CH4和C3H8遵從碳數(shù)響應規(guī)律,其配比不會影響定量的準確性,可根據(jù)樣品總烴和甲烷比例適當配制;對于低濃度樣品,以空氣為底氣的總烴響應靈敏度低于氮氣為底氣的總烴響應靈敏度,采用以氮氣為底氣的標準氣來定量空氣中總烴的含量時,測定結果將產(chǎn)生較大偏差,甚可能產(chǎn)生負值,應該用以除烴空氣為底氣的標準氣來定量空氣樣品;某些樣品測定過程中,總烴不只出一個峰,需要調節(jié)相關條件再進行測定。

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: