Temperature-Induced Inversion of the Elution Order of Enantiomers in Gas Chromatography: N-Ethoxycarbonyl Propylamides andN-Trifluoroacetyl Ethyl Esters of α-Amino Acids on Chirasil-Val-C11and Chirasil-Dex Stationary Phases

2007 ◽  
Vol 79 (12) ◽  
pp. 4401-4409 ◽  
Author(s):  
Pavel A. Levkin ◽  
Anna Levkina ◽  
Harri Czesla ◽  
Volker Schurig
Keyword(s):  
Amino Acids ◽  
Gas Chromatography ◽  
Stationary Phases ◽  
Ethyl Esters ◽  
Elution Order

Relations between chromatographic parameters and physical properties of some alkyl tert-butyl ethers

1982 ◽  
Vol 47 (7) ◽  
pp. 1979-1987 ◽  
Author(s):  
Michal Šingliar ◽  
Vendelín Macho ◽  
Miroslav Kavala
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Physical Properties ◽  
Homologous Series ◽  
Stationary Phases ◽  
Elution Order ◽  
Tert Butyl ◽  
Stationary Phase Polarity ◽  
Chromatographic Parameters ◽  
Retention Parameters

Retention parameters of alkyl tert-butyl ethers have been measured by gas chromatography using stationary phases of various polarity. The stationary phase polarity influences elution order of a pair alcohol/ether as well as their resolution degree. Dependence of log Vg vs boiling temperature of the ethers is linear within a given homologous series of compounds except for the first two members. The retention times of ethers and alcohols have been found to coincide when using di-n-heptyl phthalate as stationary phase.

Gas Chromatography With Optically Active Stationary Phases: Resolution of Amino Acids

1970 ◽  
Vol 8 (4) ◽  
pp. 177-182 ◽  
Author(s):  
S. Nakaparksin ◽  
P. Birrell ◽  
E. Gil-Av ◽  
J. Oro
Keyword(s):  
Amino Acids ◽  
Gas Chromatography ◽  
Stationary Phases ◽  
Optically Active

Analysis of Aromatic Amines in Industrial Wastewater by Capillary Gas Chromatography-Mass Spectrometry

2000 ◽  
Vol 35 (2) ◽  
pp. 245-262 ◽  
Author(s):  
Francis I. Onuska ◽  
Ken A. Terry ◽  
R. James Maguire
Keyword(s):  
Gas Chromatography ◽  
Aromatic Amines ◽  
Methylene Chloride ◽  
Solid Phase ◽  
Stationary Phases ◽  
Gas Chromatography Mass Spectrometry ◽  
Substituted Anilines ◽  
Environmental Media ◽  
Solid Phase Extraction Cartridge ◽  
Wide Range

Abstract The analysis of aromatic amines, particularly benzidines, at trace levels in environmental media has been difficult because of the lack of suitable deactivated capillary column stationary phases for gas chromatography. This report describes the use of an improved type of column as well as a method for the analysis of anilines and benzidines in water, wastewater and sewage samples. Extraction procedures are applicable to a wide range of compounds that are effectively partitioned from an aqueous matrix into methylene chloride, or onto a solid-phase extraction cartridge. The extracted analytes are also amenable to separation on a capillary gas chromatographic column and transferable to the mass spectrometer. These contaminants are converted to their N-trifluoroacetyl derivatives. Aniline and some substituted anilines, and 3,3’-dichlorobenzidine and benzidine were determined in 24-h composite industrial water, wastewater, primary sludge and final effluent samples at concentrations from 0.03 up to 2760 µg/L.

New Methods for Analyzing Water Pollutants

1982 ◽  
Vol 14 (4-5) ◽  
pp. 59-71 ◽  
Author(s):  
L H Keith ◽  
R C Hall ◽  
R C Hanisch ◽  
R G Landolt ◽  
J E Henderson
Keyword(s):  
Amino Acids ◽  
Gas Chromatography ◽  
Two Dimensional ◽  
Gas Chromatograph ◽  
New Class ◽  
New Methods ◽  
System A ◽  
Drinking Waters ◽  
Computer Controlled ◽  
Nitrogen Containing Compounds

Two new methods have been developed to analyze for organic pollutants in water. The first, two-dimensional gas chromatography, using post detector peak recycling (PDPR), involves the use of a computer-controlled gas Chromatograph to selectively trap compounds of interest and rechromatograph them on a second column, recycling them through the same detector again. The second employs a new detector system, a thermally modulated electron capture detector (TMECD). Both methods were used to demonstrate their utility by applying them to the analysis of a new class of potentially ubiquitous anthropoaqueous pollutants in drinking waters- -haloacetonitriles. These newly identified compounds are produced from certain amino acids and other nitrogen-containing compounds reacting with chlorine during the disinfection stage of treatment.

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