Comparison of retention behaviour of aromatic sulphonic acids in reversed-phase systems with mobile phases containing ion-pairing ions and in systems with solutions of inorganic salts as the mobile phases

The retention of 34 naphthalene and anthraquinone sulphonic acids, which are important as dye intermediates, was measured on C 18 and C 8 columns in mobile phases containing either an ion-pairing reagent or an inorganic salt in aqueous methanolic solvents. The influence on retention of the length of...

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Bibliographic Details
Published in:Journal of Chromatography A 1983, Vol.262, p.121-140
Main Authors: Jandera, Pavel, Churáček, Jaroslav, Taraba, Boleslav
Format: Article
Language:English
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Summary:The retention of 34 naphthalene and anthraquinone sulphonic acids, which are important as dye intermediates, was measured on C 18 and C 8 columns in mobile phases containing either an ion-pairing reagent or an inorganic salt in aqueous methanolic solvents. The influence on retention of the length of the bonded alkyl chains, of the nature and concentration of the ion-pairing reagent (an alkylammonium ion), of the inorganic salt (sodium sulphate) and of methanol in the mobile phase was investigated. Systems containing inorganic salts offer distinct advantages for the separation of sulphonic acids with different numbers of sulphonic groups and allow some efficient separations that are not feasible in the mobile phases with ion-pairing reagents. An explanation of the retention mechanism is attempted.
ISSN:0021-9673
DOI:10.1016/S0021-9673(01)88093-6