Effect of a change in the thermal conductivity detector output signal on the error in chromatographic determination of the component composition of natural gas

1996 ◽  
Vol 39 (1) ◽  
pp. 111-112
Author(s):  
E. A. Khatskevich
Keyword(s):  
Thermal Conductivity ◽  
Natural Gas ◽  
Output Signal ◽  
Chromatographic Determination ◽  
Component Composition ◽  
Thermal Conductivity Detector ◽  
Detector Output

scholarly journals New Method of Denitrification Analysis of Bradyrhizobium Field Isolates by Gas Chromatographic Determination of 15N-Labeled N2

2004 ◽  
Vol 70 (5) ◽  
pp. 2886-2891 ◽  
Author(s):  
Reiko Sameshima-Saito ◽  
Kaori Chiba ◽  
Kiwamu Minamisawa
Keyword(s):  
Thermal Conductivity ◽  
Detection Limit ◽  
Bradyrhizobium Japonicum ◽  
Chromatographic Determination ◽  
New Method ◽  
Thermal Conductivity Detector ◽  
Gas Chromatograph ◽  
Carrier Gas ◽  
Field Isolates

ABSTRACT To evaluate the denitrification abilities of many Bradyrhizobium field isolates, we developed a new 15N-labeled N2 detection methodology, which is free from interference from atmospheric N2 contamination. 30N2 (15N15N) and 29N2 (15N14N) were detected as an apparent peak by a gas chromatograph equipped with a thermal conductivity detector with N2 gas having natural abundance of 15N (0.366 atom%) as a carrier gas. The detection limit was 0.04% 30N2, and the linearity extended at least to 40% 30N2. When Bradyrhizobium japonicum USDA110 was grown in cultures anaerobically with 15NO3 −, denitrification product (30N2) was detected stoichiometrically. A total of 65 isolates of soybean bradyrhizobia from two field sites in Japan were assayed by this method. The denitrification abilities were partly correlated with filed sites, Bradyrhizobium species, and the hup genotype.

Gas Chromatographic Determination of Ethyl O,O-Dimethyldithiophosphoryl- 1-Phenyl Acetate in Technical Grade Cidial and Its 50% Liquid Formulation

1969 ◽  
Vol 52 (1) ◽  
pp. 52-55
Author(s):  
B Bazzi ◽  
L Abbruzzese ◽  
G Galluzzi
Keyword(s):  
Thermal Conductivity ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Phenyl Acetate ◽  
Thermal Conductivity Detector ◽  
Liquid Formulation ◽  
Technical Grade ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method has heen developed for analysis of ethyl O,O-dimethyldithiophosphoryl- 1-phenyl acetate. The insecticide or a convenient amount of an insecticidal preparation is dissolved in toluene, together with a suitable internal standard, and analyzed by gas chromatography, using a thermal conductivity detector. The precision (P = 0.05) of the method is ±1.5% of the concentration found.

Gas Chromatographic Determination of O,O-Diethyl S-(N-Isopropylcarbamoylmethyl) Phosphorothiolothionate (Prothoate) in Technical Products and Liquid Formulations

1972 ◽  
Vol 55 (6) ◽  
pp. 1336-1338
Author(s):  
Brunetto Bazzi ◽  
Guglielmo Galluzzi ◽  
Luigi Abruzzese
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Chromatographic Method ◽  
Concentration Level ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Thermal Conductivity Detector ◽  
Gas Chromatographic Method ◽  
Technical Products

Abstract A gas chromatographic method has been developed for the analysis of O,O-diethyl S-(N-isopropylcarbamoylmethyl) phosphorothiolothionate . The acaricide or a convenient amount of an acaricidal preparation is dissolved in xylene, together with malathion as an internal standard, and analyzed by gas chromatography, using a thermal conductivity detector. The precision (P = 0.05) of the method is ±1.5% of the concentration level.

Automated Thermal Conductivity Determination of Carbon Dioxide in Wine

1981 ◽  
Vol 64 (3) ◽  
pp. 547-549
Author(s):  
J Dale Mitchell ◽  
Christian R Benjamin
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Good Accuracy ◽  
Enzymatic Method ◽  
Average Difference ◽  
Thermal Conductivity Detector ◽  
Co2 Gas ◽  
Automatic Analyzer

Abstract Determination of CO2 in Lambrusco, using an automatic analyzer, has proven to be both fast and precise. The analyzer uses a thermal conductivity detector to measure CO2 gas liberated from the sample. Good accuracy was obtained when the method was compared to the enzymatic method. Ten samples gave an average difference of 1.4% from the accepted method.

Manual Headspace Gas-Solid Chromatographic Determination of Sub-Parts per Trillion Levels of Acrylonitrile in 3% Acetic Acid

1982 ◽  
Vol 65 (1) ◽  
pp. 184-187
Author(s):  
Timothy McNeal ◽  
Charles V Breder
Keyword(s):  
Acetic Acid ◽  
Detection Limit ◽  
Vapor Phase ◽  
Chromatographic Determination ◽  
Headspace Sampling ◽  
Carbonated Beverages ◽  
Headspace Gas ◽  
Detector Output ◽  
Output Amplifier

Abstract A procedure was developed for determining acrylonitrile (AN) in 3% acetic acid, the solvent used to simulate carbonated beverages. Manual headspace sampling, a detector output amplifier/filter, and vapor phase enhancement using an ionic material were combined to give a detection limit in the low parts per trillion range. AN standards were analyzed using the method, and the results are presented.

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