Abstract
Retention data of the positively charged adrenaline ion, when plotted against the surface concentration of the adsorbed alkysulphonate pairing ion and the mobile-phase concentration of the inorganic counter ion (sodium), fall on a common retention surface, irrespective of the chain length of the pairing ion used. This common retention surface can be used to reconcile the apparently conflicting reports on the effects of the concentration and chain length of the alkylsulphonate pairing ion and the concentration of the inorganic counter ion. It can also be used for a better understanding and control of both retention and separation selectivity in reversed-phase ion-pair chromatography.
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