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氣相色譜法測定大氣中非甲烷總烴量
氣相色譜法測定大氣中非甲烷總烴量 詳細信息：

固定相：高分子小球

GDX-502，2m*3mm，2m*4mm，2m*1/8，60-80目

甲烷柱

總烴柱

2m*3mm，2m*4mm，2m*1/8，硅烷化玻璃微球

滕州市浩瀚色譜儀器技術(shù)服務有限公司，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(jié)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(jié)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(diào)節(jié)相關(guān)條件再進行測定。

氣相色譜法測定大氣中非甲烷總烴量 圖片：


Determination of total non-methane hydrocarbons in the atmosphere by gas chromatography
Determination of total non-methane hydrocarbons in the atmosphere by gas chromatography

Stationary phase: polymer pellet
GDX-502, 2m*3mm, 2m*4mm, 2m*1/8, 60-80 mesh
Methane column

Total hydrocarbon column
2m*3mm, 2m*4mm, 2m*1/8, silanized glass microspheres

Tengzhou Haohao Chromatography Instrument Technology Service Co., Ltd. used direct injection differential gas chromatography to determine the amount of non-methane total hydrocarbons (NMHC). The effects of analytical conditions, gas source and quantitative methods on the quantitative accuracy of NMHC were studied experimentally. Considering the lower baseline response and higher sensitivity, selecting the appropriate hydrogen and air flow rate, the detection limit of NMHC method is 0.03 mg/m3 (calculated as carbon), which can ensure the accuracy of low concentration sample analysis. The experimental results show that CH4 and C3H8 in the standard gas comply with the carbon number response law, and the ratio does not affect the accuracy of the quantification. It can be properly prepared according to the total hydrocarbon and methane ratio of the sample; for the low concentration sample, the total hydrocarbon with air as the base gas The response sensitivity is lower than the total hydrocarbon response sensitivity of nitrogen as the bottom gas. When the standard gas with nitrogen as the base gas is used to quantify the total hydrocarbon content in the air, the measurement results will have a large deviation, and may even produce a negative value, which should be used to remove hydrocarbons. Air is the standard gas for the bottom gas to quantify the air sample; in some samples, the total hydrocarbons not only have one peak, but the relevant conditions need to be adjusted before measurement.

Determination of Total Hydrocarbons in the Atmosphere by Gas Chromatography

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