The reason for non-linear variation of specific retention volumes and retention indices for members of homologous series of organic compounds

1983 ◽  
Vol 17 (11) ◽  
pp. 613-622 ◽  
Author(s):  
R. V. Golovnya ◽  
D. N. Grigoryeva
Keyword(s):  
Organic Compounds ◽  
Homologous Series ◽  
Retention Indices ◽  
Linear Variation ◽  
Specific Retention Volumes ◽  
Non Linear ◽  
Specific Retention ◽  
Retention Volumes

Adsorption of Vapours of Some Organic Compounds on Surface of Iron-Substituted Layered Vanadyl Phosphate

2000 ◽  
Vol 65 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Pavel Hradil ◽  
Jiří Votinský ◽  
Karel Komárek ◽  
Vítězslav Zima ◽  
Jaroslava Kalousová ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Organic Molecules ◽  
Ferric Ions ◽  
Vanadyl Phosphate ◽  
Enthalpy Of Adsorption ◽  
Adsorbent Surface ◽  
Specific Retention Volumes ◽  
Specific Retention ◽  
Retention Volumes ◽  
Chromatographic Measurement

Gas chromatographic measurement of specific retention volumes of vapours of selected groups of organic compounds has been used to determine differential molar enthalpy of adsorption of their molecules on the surface of layered vanadyl phosphate substituted with ferric ions having the composition of [Fe(H2O)]0.20(VO)0.80PO4. Various types of bonds of the molecules to the surface of the layered adsorbent including their probable orientation with respect to the layers have been discussed. It was observed a dependence of the specific peak elution volume and shape of chromatographic peak on the sample size in the cases of those compounds whose molecules are chemically bound to the adsorbent surface. A connection is pointed out between the adsorption strength of the organic molecules on the layered adsorbent and the tendency of the system to undergo intercalation reaction.

Indirect determination of specific retention volumes in gas chromatography use of the retention indices of McReynolds' samples

1985 ◽  
Vol 333 ◽  
pp. 1-9 ◽  
Author(s):  
Elena Fernández-Sánchez ◽  
José Antonio García-Domínguez ◽  
Vicente Menéndez ◽  
Enrique Pertierra-Rimada
Keyword(s):  
Gas Chromatography ◽  
Retention Indices ◽  
Indirect Determination ◽  
Specific Retention Volumes ◽  
Specific Retention ◽  
Retention Volumes

scholarly journals Evaluation of a Hypercrosslinked Polystyrene, MN-200, as a Sorbent for the Preconcentration of Volatile Organic Compounds in Air

2000 ◽  
Vol 83 (3) ◽  
pp. 579-583 ◽  
Author(s):  
Maria P Baya ◽  
Panayotis A Siskos ◽  
Vadim A Davankov
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Polar Compounds ◽  
Average Percentage ◽  
Volatile Organic ◽  
Specific Retention Volumes ◽  
Specific Retention ◽  
Retention Volumes ◽  
And Storage ◽  
Indoor And Outdoor

Abstract Breakthrough volumes, average percentage recoveries, and storage stabilities were obtained for vapors of 8 volatile organic compounds (pentane, octane, undecane, isooctane, cyclohexane, toluene, methanol, and dichloromethane) on a new adsorbent material, Hypersol-Macronet, MN-200. Breakthrough volumes were estimated as half of the gas chromatographic specific retention volumes at 20°C for the compounds. Recoveries of the adsorbates were determined by both solvent extraction and thermal desorption methods. The results obtained compare favorably with those for Tenax GR (values reported in the published literature and others obtained in our laboratory). Results of storage stability studies on MN-200 meet the criterion for acceptability (<10% loss). High adsorption capacity for very volatile and polar compounds, combined with ease of desorption of less volatile compounds, render MN-200 a highly promising adsorbent for sampling volatile organic compounds in indoor and outdoor air.

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