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Modification of silanized supports for gas-liquid chromatography

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Summary

Certain physico-chemical aspects of the modification of supports are discussed in case of different packings with non-polar stationary phases on silanized support. Variations of non-linearity of the adsorption isotherm and retention data after modification of the non-polar packings were measured. It was found that in many cases the intermolecular forces increase after modification when using polar solutes; this fact is the reason for the temperature range where the modification is desirable. A change in the molar entropy of solution is the main reason for decreasing retention of the polar solutes after the modification. Some requirements of the ideal modification are discussed and examples for “self-modification” of the silicone stationary phases are given.

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Abbreviations

A:

relative value of non-linearity of the adsorption isotherm

A* :

temperature dependence of the A-value,

A1 :

constant in eq. (1)

B:

constant in eq. (1)

F0 :

entropic selectivity

ΔHa :

molar heat of the interphase adsorption

ΔHs :

molar heat of solution related to the packing

ΔHs1 :

molar heat of solution rleated to solubility in the stationary phase

h:

peak height

Ka :

distribution coefficient of the interphase adsorption

k, k′, k″:

constants

po :

vapour pressure of the pure solute

R:

gas constant

r:

relative retention

ΔSs :

molar entropy of solution

Sa :

the interphase surface

T:

column temperature °K

Tb :

boiling point °K

Vg :

specific retention volume

VN :

net retention volume

V iN :

isobaric net retention volume

V sN :

net retention volume related to solubility

V aN :

net retention volume related to the interphase adsorption

wL :

weight of the stationary phase in the column

wM :

weight of the modifier in the column, subscript

°:

at thermodynamic function means the relative value

m:

at retention value means that this value is determined at the minimum of the relationship between VN and h

T:

at the value means that this value is calculated to column temperature

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Authors and Affiliations

  1. Institute of Physical Chemistry, Academy of Sciences, Ukrainian Soviet Socialist Republic, pr. Nauki 31, 252028, Kiev, USSR

    A. N. Korol, G. M. Belokleytseva & G. V. Filonenko

Authors
  1. A. N. Korol
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  2. G. M. Belokleytseva
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  3. G. V. Filonenko
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Korol, A.N., Belokleytseva, G.M. & Filonenko, G.V. Modification of silanized supports for gas-liquid chromatography. Chromatographia 12, 95–105 (1979). https://doi.org/10.1007/BF02302933

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