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Chromatographia

, Volume 12, Issue 2, pp 95–105 | Cite as

Modification of silanized supports for gas-liquid chromatography

  • A. N. Korol
  • G. M. Belokleytseva
  • G. V. Filonenko
Originals

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.

Key Words

Gas-liquid chromatography Supports Thermodynamics Stationary phase non-polar Solid-liquid interphase 

List of Symbols

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

VNi

isobaric net retention volume

VNs

net retention volume related to solubility

VNa

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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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1979

Authors and Affiliations

  • A. N. Korol
    • 1
  • G. M. Belokleytseva
    • 1
  • G. V. Filonenko
    • 1
  1. 1.Institute of Physical Chemistry, Academy of SciencesUkrainian Soviet Socialist RepublicKievUSSR

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