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氣相色譜六通閥氣體進(jìn)樣技巧
氣相色譜六通閥氣體進(jìn)樣技巧 詳細(xì)信息：

在氣相色譜法,庫(kù)侖法儀器分析中,氣體進(jìn)樣操作不當(dāng)是定量分析誤差的主要來(lái)源之一.進(jìn)樣系統(tǒng)的原理,結(jié)構(gòu),使用的材料,進(jìn)樣時(shí)的溫度,進(jìn)樣量,進(jìn)樣速度,進(jìn)樣用的工具都會(huì)對(duì)分析結(jié)果的重復(fù)性和準(zhǔn)確性產(chǎn)生直接影響.以氣相色譜氣體分析為例說(shuō)明常壓氣體進(jìn)樣時(shí)六通閥定體積進(jìn)樣的使用.

應(yīng)用實(shí)例：環(huán)境空氣/固定污染源廢氣中非甲烷總烴的測(cè)定

滕州市浩瀚色譜儀器技術(shù)服務(wù)有限公司，通過(guò)采用三通連接兩個(gè)具有1.0m L定量環(huán)的六通閥,以雙柱單FID檢測(cè)器的氣相色譜儀對(duì)環(huán)境中的非甲烷總烴進(jìn)行測(cè)定?？偀N的濃度扣除甲烷濃度和氧的干擾,即可得到非甲烷總烴的濃度,可以實(shí)現(xiàn)當(dāng)次分析樣品,得到包含總烴、甲烷的圖譜,完成總烴、甲烷、非甲烷總烴濃度的測(cè)定。當(dāng)進(jìn)樣體積為1.0m L時(shí),總烴的檢出限為:1.6×10-2mg/m3,甲烷的檢出限為:1.3×10-2mg/m3。采用單FID檢測(cè)器,單次注射樣品,消除多次注射樣品和雙FID檢測(cè)器因靈敏度差異引起的誤差;同時(shí),改進(jìn)沒有使用十通閥等復(fù)雜且并不常用的配件,充分利用了實(shí)驗(yàn)室現(xiàn)有的儀器條件,適合條件類似的實(shí)驗(yàn)室進(jìn)行改進(jìn)。


氣相色譜六通閥氣體進(jìn)樣技巧 圖片及安裝圖紙：




Gas sampling technique with six-port valve for gas chromatography
Gas sampling technique with six-port valve for gas chromatography

Matters needing attention and some skills in the six-way valve sampling of atmospheric gas in gas chromatography.Appropriate application of these skills helps to ensure the accuracy and reproducibility of the analysis.


In gas chromatography and coulometric instrument analysis, improper gas sampling operation is one of the main sources of quantitative analysis errors. The principle, structure, materials used, temperature at the time of injection, sample volume, and sample injection Speed and the tools used for sample injection will have a direct impact on the repeatability and accuracy of the analysis results. Take gas chromatography gas analysis as an example to illustrate the use of six-way valve fixed-volume injection during atmospheric gas injection.

Application example: Determination of non-methane total hydrocarbons in ambient air/stationary pollution source exhaust gas

Tengzhou Haohan Chromatography Instrument Technology Service Co., Ltd. uses a three-way connection with two six-way valves with a 1.0 mL quantitative ring to determine the total non-methane hydrocarbons in the environment by a gas chromatograph with a double column and a single FID detector. The concentration of total hydrocarbons deducts the interference of methane concentration and oxygen, and the concentration of non-methane total hydrocarbons can be obtained, which can realize the current analysis of samples and obtain a map containing total hydrocarbons and methane, and complete the concentration of total hydrocarbons, methane, and non-methane total hydrocarbons. Determination. When the injection volume is 1.0ml, the detection limit of total hydrocarbons is 1.6×10-2mg/m3, and the detection limit of methane is 1.3×10-2mg/m3. Using single FID detector, single injection of samples, eliminating errors caused by multiple injection samples and dual FID detectors due to sensitivity differences; at the same time, the improvement does not use complicated and infrequent accessories such as ten-port valves, making full use of the laboratory The existing instrument conditions are suitable for improvement in laboratories with similar conditions.


Gas Chromatography Six-way Valve Gas Sampling Skills Pictures and installation drawings: