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.

scholarly journals Thermal and Hydrothermal Treatment of Silica Gels as Solid Stationary Phases in Gas Chromatography

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ashraf Yehia El-Naggar
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Hydrothermal Treatment ◽  
Aromatic Hydrocarbons ◽  
High Efficiency ◽  
Silica Surface ◽  
Stationary Phases ◽  
Silica Gels ◽  
Good Separation ◽  
Treatment Techniques

Silica gel was prepared and treated thermally and hydrothermally and was characterized as solid stationary phase in gas chromatography. The characteristics have been evaluated in terms of polarity, selectivity, and separation efficiencies. These parameters were used to assess the outer silica surface contributions and the degree of surface deactivation brought about by different treatment techniques. The parent silica elutes the paraffinic hydrocarbons with high efficiency of separation and elutes aromatic hydrocarbons with nearly good separation and has bad separation of alcohols. The calcined silica at 500°C and 1000°C has a pronounced effect on the separation of aromatic hydrocarbons compared with the parent silica and hydrothermal treatment of silica. With respect to alcohols separation, the obtained bad separations using treated and untreated silica reflect the little effect of the thermal and hydrothermal treatment on the silica surface deactivation.

scholarly journals Retention, separation selectivity and system efficiency of selected basic psychotropic drugs on different RPLC columns

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Petruczynik ◽  
Karol Wróblewski ◽  
Kamil Dzioba ◽  
Monika Waksmundzka-Hajnos
Keyword(s):  
Stationary Phase ◽  
Psychotropic Drug ◽  
Psychotropic Drugs ◽  
Stationary Phases ◽  
Acetate Buffer ◽  
System Efficiency ◽  
Organic Modifiers ◽  
Reverse Phase ◽  
Separation Selectivity ◽  
Retention Parameters

AbstractRetention parameters of psychotropic drug standards were determined on different columns, i.e., Octadecyl silica, Phenyl, Phenyl-Hexyl, Polar Reverse Phase, Pentafluorophenyl, and Cyanopropyl using aqueous eluent systems containing methanol or acetonitrile as organic modifiers, acetate buffer at pH 3.5 and addition of silanol blocker − diethylamine (DEA).The retention, separation selectivity, and sequence of elution were different when using eluents containing various organic modifiers. The significant differences were observed in retention parameters with a change of the used stationary phase. The various properties of stationary phases resulted in differences in analyte retention, peaks shape, systems efficiency and separation selectivity. The best shape of peaks were on Cyanopropyl (CN) column and the highest efficiency for most investigated psychotropic drugs were obtained on Phenyl-Hexyl and Polar RP columns.

Analysis of hydroformylation products of higher n-alkenes by capillary gas chromatography

1985 ◽  
Vol 50 (8) ◽  
pp. 1808-1818 ◽  
Author(s):  
Ján Krupčík ◽  
Dušan Repka
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Reaction Mechanism ◽  
Stationary Phase ◽  
Capillary Gas Chromatography ◽  
Stationary Phases ◽  
Capillary Columns ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry

A mixture of alcohols obtained by hydroformylation of C10-C13 n-alkenes was analyzed by capillary gas chromatography using Carbowax 20M stationary phase, and acetates prepared from the alcohols were analyzed on capillary columns using Carbowax 20M and Apiezon L stationary phases. The capillary gas chromatography and gas chromatography-mass spectrometry treatment gave evidence that all of the 24 alcohols that could form by the hydroformylation reaction mechanism were present.

Study of 3-(5-X-2-furyl)acrylic acids and their methyl esters by gas chromatography

1979 ◽  
Vol 44 (3) ◽  
pp. 942-945 ◽  
Author(s):  
Oľga Rajniaková ◽  
Jarmila Štetinová ◽  
Jaroslav Kováč
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases ◽  
Methyl Esters ◽  
Chromatographic Parameters ◽  
Acrylic Acids

The Kovát's indices and homomorphous factors of 3-(5-substituted-2-furyl)acrylic acids and their methyl esters were determined on stationary phases UCW 98 and OV 17 at 180 °C. It was found that the values of both chromatographic parameters increase with increasing polarity of the molecule.

scholarly journals Separation performance of p-tert-butyl(tetradecyloxy)calix[6]arene as a stationary phase for capillary gas chromatography

RSC Advances ◽  
2019 ◽  
Vol 9 (66) ◽  
pp. 38486-38495
Author(s):  
Tao Sun ◽  
Xiaomin Shuai ◽  
Yujie Chen ◽  
Xinyu Zhao ◽  
Qianqian Song ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Capillary Gas Chromatography ◽  
Separation Performance ◽  
Tert Butyl

This work presents the first example of the utilization of p-tert-butyl(tetradecyloxy)calix[6]arene (C6A-C10) as a stationary phase for capillary gas chromatographic (GC) separation.

Preparation of mixed stationary phase of cellulose and polysiloxane ionic liquid for gas chromatography

2014 ◽  
Vol 32 (10) ◽  
pp. 1117
Author(s):  
Gang CHEN ◽  
Xiaojie ZHAO ◽  
Jun XING ◽  
Yuhua YAO ◽  
Jingjing ZHENG
Keyword(s):  
Gas Chromatography ◽  
Ionic Liquid ◽  
Stationary Phase ◽  
Mixed Stationary Phase

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.

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