scholarly journals Experiments with a cyclic closed-loop gas chromatograph

1984 ◽  
Vol 62 (11) ◽  
pp. 2260-2263
Author(s):  
Roberta Back ◽  
R. A. Back
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Closed Loop ◽  
Thermal Conductivity Detector ◽  
Gas Chromatograph ◽  
Peak Broadening ◽  
Equivalent Length ◽  
Length Separation ◽  
Carrier Gases ◽  
Better Than

A cyclic closed-loop gas chromatrograph, comprising a column, a thermal conductivity detector, and a peristaltic circulating pump, together with valves for sample pick-up and carrier gas admission, is described. Injected samples could be recycled many times, providing very long effective column lengths, and separations were markedly better than on a single-pass column of equivalent length. Separation of two components, and peak broadening with single components, were measured over many successive cycles for a variety of samples, carrier gases, and conditions. The use of the cyclic chromatograph for testing columns and for studying basic processes in gas chromatography is demonstrated and discussed.

DETERMINATION OF WATER IN FERMENTED FEEDS BY GAS CHROMATOGRAPHY

1981 ◽  
Vol 61 (3) ◽  
pp. 827-831 ◽  
Author(s):  
T. W. FENTON ◽  
MIRJANA FENTON ◽  
G. W. MATHISON
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Chemical Method ◽  
Thermal Conductivity Detector ◽  
Gas Chromatograph ◽  
Water Determination ◽  
Chromatographic Procedure

A gas chromatographic procedure for measuring water in fermented feeds was developed and evaluated. The method involves extracting the water with alcohol followed by the separation of the water and alcohol with a Porapak QS column in a gas chromatograph equipped with a thermal conductivity detector. Linear responses were obtained when the ratios of the peak area of water to alcohol were plotted against the weight ratios of water to alcohol (mg/g). The method has the advantage of being very fast, and is as accurate as a chemical method used for water determination.

Analysis of Xenon Response by Micro-Thermal Conductivity Detector for Gas Chromatography

2012 ◽  
Vol 40 (7) ◽  
pp. 1130-1134 ◽  
Author(s):  
Shu-Jiang LIU ◽  
Zhan-Ying CHEN ◽  
Yin-Zhong CHANG ◽  
Shi-Lian WANG ◽  
Qi LI ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Thermal Conductivity Detector

Observation of atmospheric oxygen/nitrogen ratio aboard a cargo ship using gas chromatography/thermal conductivity detector

2012 ◽  
Vol 117 (D4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hiroaki Yamagishi ◽  
Yasunori Tohjima ◽  
Hitoshi Mukai ◽  
Yukihiro Nojiri ◽  
Chihiro Miyazaki ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Atmospheric Oxygen ◽  
Thermal Conductivity Detector ◽  
Nitrogen Ratio
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