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超純氫中痕量O_2+Ar、N_2、CO、CH_4和CO_2測(cè)定
超純氫中痕量O_2+Ar、N_2、CO、CH_4和CO_2測(cè)定 詳細(xì)信息：

浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司用氣相色譜法測(cè)定了超純氫中痕量雜質(zhì)O_2+Ar、N_2、CO、CH_4和CO_2。將TCD和FID與預(yù)濃縮技術(shù)結(jié)合,當(dāng)濃縮樣品量為10升時(shí),檢測(cè)靈敏度分別達(dá)到O_2+Ar為0.2ppbV、N_2為0.4ppbV、CO為0.05ppbV、CH_4為0.2ppbV和CO_2為0.3ppbV。提出用濃縮體積差值法和按峰面積法兩種方法計(jì)算樣品中雜質(zhì)濃度,前一種方法可消除載氣中雜質(zhì)濃度的影響。

名稱：MS5?填充柱
規(guī)格：1m*1/8，60-80Mesh
*高使用溫度：300°C
編號(hào)：20221207007
應(yīng)用：氫，氧，氮，甲烷，一氧化碳的分離

名稱：填充柱

型號(hào)：GDX-104

規(guī)格：3m*4mm，60-80目

*高溫度：250°C

浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司,研究了氧氣對(duì)空氣中甲烷、總烴分析時(shí)的干擾.得出,載氣的純度很高時(shí)使用GDX-502填充柱可以將甲烷峰和氧峰完全分離,甲烷和總烴和分析可不受氧峰干擾,氣樣中氧氣濃度低于17%時(shí)氧峰可忽略,低于12.5%時(shí)氧峰消失.氫火焰離子化檢測(cè)器不能檢出氧氣,氧峰僅為干擾峰,在一定的色譜條件下,干擾峰即氧峰和氣樣中的氧氣濃度成正比關(guān)系.當(dāng)氣樣中氧氣濃度小于28.7%時(shí),總烴值峰值等于甲烷測(cè)試時(shí)氧峰和各烴峰之和,當(dāng)氧氣濃度大于28.7%時(shí),不能用國(guó)標(biāo)氣相色譜法測(cè)試總烴,總烴值應(yīng)等于總烴峰值值減去該氣樣的氧值.

超純氫中痕量O_2+Ar、N_2、CO、CH_4和CO_2測(cè)定測(cè)試譜圖：



Trace O in ultrapure hydrogen_ 2+Ar、N_ 2、CO、CH_ 4 and CO_ 2 Determination

Trace O in ultrapure hydrogen_ 2+Ar、N_ 2、CO、CH_ 4 and CO_ 2 Determination details:




The trace impurity O in ultrapure hydrogen was determined by gas chromatography in Haohan Chromatography (Shandong) Application Technology Development Co., Ltd_ 2+Ar、N_ 2、CO、CH_ 4 and CO_ 2。 Combining TCD and FID with pre concentration technology, when the concentration sample volume is 10 liters, the detection sensitivity reaches O respectively_ 2+Ar is 0.2ppbV, N_ 2 is 0.4ppbV, CO is 0.05ppbV, CH_ 4 is 0.2ppbV and CO_ 2 is 0.3ppbV. Two methods, concentration volume difference method and peak area method, are proposed to calculate the impurity concentration in the sample. The former method can eliminate the influence of the impurity concentration in the carrier gas.





Name: MS5A packed column

Specification: 1m * 1/8, 60-80Mesh

*High service temperature: 300 ° C

No.: 20221207007

Application: separation of hydrogen, oxygen, nitrogen, methane and carbon monoxide

Name: Filled column



Model: GDX-104



Specification: 3m * 4mm, 60-80 meshes



*High temperature: 250 ° C










The interference of oxygen on the analysis of methane and total hydrocarbons in air was studied by Haohan Chromatography (Shandong) Application Technology Development Co., Ltd It is concluded that when the purity of the carrier gas is very high, the use of GDX-502 packed column can completely separate the methane peak and the oxygen peak. The methane and total hydrocarbons and analysis can not be interfered by the oxygen peak. When the oxygen concentration in the gas sample is lower than 17%, the oxygen peak can be ignored, and when it is lower than 12.5%, the oxygen peak disappears The hydrogen flame ionization detector cannot detect oxygen, and the oxygen peak is only an interference peak. Under certain chromatographic conditions, the interference peak, that is, the oxygen peak, is proportional to the oxygen concentration in the gas sample. When the oxygen concentration in the gas sample is less than 28.7%, the total hydrocarbon value peak is equal to the sum of the oxygen peak and each hydrocarbon peak in the methane test. When the oxygen concentration is greater than 28.7%, the total hydrocarbon cannot be tested by the national standard gas chromatography. The total hydrocarbon value should be equal to the total hydrocarbon peak value minus the oxygen value of the gas sample





Trace O in ultrapure hydrogen_ 2+Ar、N_ 2、CO、CH_ 4 and CO_ 2 Determination of test spectrum: