Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume 37, Number
11, November 1999, pp. 429-435
Determination
of Solute–Aggregate Binding Constants of Some Polycyclic Aromatic Hydrocarbons
by High-Performance Liquid Chromatography in the Presence of CTAB–Alcohol–Water
Systems with High Percentages of Alcohol
P.
Ramos-Lledó, M.P. San Andrés, and S. VeraThis
work presents the chromatographic study of the association between 5 polycyclic
aromatic hydrocarbons and the aggregates formed by a cationic surfactant in the
presence of a high percentage of two different alcohols, n-propanol (20–50%,
v/v) and ethanol (50–75%, v/v). A generalization of the classical equations
for micellar liquid chromatography can be used in order to determine the solute–aggregates
binding constants. Also, by means of a multiple regression, it is possible to
obtain an equation that relates the chromatographic retention (expressed as the
inverse of the retention factor) and the surfactant and alcohol concentrations.
This equation allows one to carry out an estimate of the association constants
for any quantity of alcohol.
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