大氣中非甲烷烴的色譜測定法，液化石油氣，二甲醚，三甲胺，粗苯，植物油，6號溶劑，脂肪酸，甲醛，甲酸，甲醇，變壓器油，多氯聯(lián)苯，乙酸乙酯

大氣中非甲烷烴的色譜測定法
大氣中非甲烷烴的色譜測定法 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

非甲烷烴是光化學煙霧的重要監(jiān)測項目之一,國外多采用色譜法測定,并有專用儀器生產(chǎn),其流程大同小異,基本上是先通過一個空柱測定總烴,再經(jīng)過一分離柱只測定甲烷,兩者之差即非甲烷烴,以ppm CH_4表示結(jié)果。分離的方法有冷凍、反吹、吸附,選擇燃燒和柱分離。實際上它測定的并不全是烴,而是包括了大氣中所有能在氫火焰上給出響應的有機物。
滕州市浩瀚色譜儀器技術(shù)服務有限公司， 提出的非甲烷烴減量分析方法，載氣為經(jīng)催化除烴之空氣。甲烷分離使用小填充量柱，并且加裝了反吹系統(tǒng)．另外，檢測器增加了尾吹。方法注意克服系統(tǒng)吸附，以使樣品中各組分獲得一致的保留時間，進而使峰高響應符合氫焰檢測器的碳數(shù)響應規(guī)律。方法標準偏差為０．０２，小檢出濃度為０．０２ｍｇ／Ｍ３，分析一次樣品僅需２分鐘。

大氣中非甲烷烴的色譜測定法 圖片：




Chromatographic determination of non-methane hydrocarbons in the atmosphere
Chromatographic determination of non-methane hydrocarbons in the atmosphere Details:

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


Non-methane hydrocarbons are one of the important monitoring projects for photochemical smog. Most of them are determined by chromatography and have special instruments. The process is similar. Basically, the total hydrocarbons are determined by an empty column, and then only a single column is used to measure methane. The difference between the two is non-methane hydrocarbon, and the result is expressed in ppm CH_4. Separation methods include freezing, backflushing, adsorption, selective combustion, and column separation. In fact, it does not measure all hydrocarbons, but includes all the organic matter in the atmosphere that gives a response on the hydrogen flame.
Tengzhou Haohao Chromatography Instrument Technology Service Co., Ltd. proposed a non-methane hydrocarbon reduction analysis method. The carrier gas is a catalytically decarbonized air. The methane separation uses a small packed column and is equipped with a backflush system. In addition, the detector adds a tail blow. The method pays attention to overcoming the adsorption of the system so that the components in the sample obtain a consistent retention time, so that the peak height response conforms to the carbon number response of the hydrogen flame detector. The standard deviation of the method was 0.02, the minimum detection concentration was 0.02 mg/M3, and it took only 2 minutes to analyze the sample once.

Chromatographic determination of non-methane hydrocarbons in the atmosphere