By G. E. Baiulescu

ISBN-10: 0080180752

ISBN-13: 9780080180755

E-book by means of Baiulescu, George E., Ilie, A.V

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Extra resources for Stationary Phases in Gas Chromatography

Example text

Wi-f l, etc. > (ii) A S ^ + i , etc. This classification is independent of the type of interaction occurring, and the theoretical treatment in each instance is common to reactions such as conventional cation-ligand complexing, hydrogen bonding or the charge-transfer interaction of organic molecules. 32 STATIONARY PHASES IN GAS CHROMATOGRAPHY Purnell derived the equations that give the values of the stability constants for each system represented and discusses the technical difficulties that arise in the determination of the partition coefficients for the more complicated examples (especially for values of n9 m, and ρ greater than unity).

He showed that these modifications are very small for n-hexadecane, greater for 1-chloronaphthalene and very important for TDPN. Eliminating the supposition that components were adsorbed on the solid support, the conclusion may be reached that solute retention depends upon adsorption on the liquid as well as upon dissolution in the bulk liquid. In such circumstances, in the absence of support adsorp( 1 6 6) tion, and following the notation of Martin, the corrected net retention volume per gram of packing ) is given by ( 1 6 6) KLVL+KAAL, (86b) where KL is the bulk liquid partition coefficient, KA is the adsorption coefficient for the gas-liquid interface, and VL and AL are the volume and surface area of the liquid per gram of packing.

By assuming that AS and AH are constant for a small change in temperature, and differentiating eqns. (75) and (76) with respect to the reciprocal temperature, E E Thus by studying the thermal variation of the activity coefficient at infinite dilution by gas-liquid chromatography, the excess partial molar enthalpy may be determined. When the excess partial molar enthalpy and free energy are known, the excess partial molar excess entropy may be calculated, using eqn. (76). Although, in the light of the above statements the importance of activity coefficients for the analytical chemist is obvious, at the present time data are not available that would allow the best stationary phase for a given mixture of components to be chosen.

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Stationary Phases in Gas Chromatography by G. E. Baiulescu


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