Abstract
ABSTRACTA method for determining counterion exchange selectivities at the surface of ionic micelles from time‐resolved fluorescence quenching measurements is developed. This method is employed to determine selectivity coefficients for thiosulfate/chloride exchange at the surface of cati‐onic hexadecyltrimethylammonium chloride micelles (KTS/CI, = 1.1 ± 0.4) and for copper (II)/sodium exchange at the surface of anionic sodium dodecyl sulfate micelles (KCu/Na= 1.3 ± 0.3). In both cases, the selectivity coefficients are found to be independent of detergent and added salt concentration.
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