Interaction of UO22+ with SDS-micelles: Association of phenols to micelles through luminescence quenching data.

WALTER A. MASSAD; PATRICIA REPOSSI; GERARDO A. ARGÜELLO

JOURNAL OF COLLOID AND INTERFACE SCIENCE

Año: 2002 vol. 255 p. 189 - 194

0021-9797

Time-resolved laser-induced fluorescence (TRLIF) has been used to study the interaction of uranyl ion with sodium dodecyl sulfate (SDS) micelles in H3PO4 1 M. The titration curve consists of two curved regions with different slopes, one of them more pronounced at low concentration of SDS and the other, with a less pronounced positive slope at larger [SDS] until a plateau is reached. The fluorescence quenching of uranyl ion by para-substituted phenol compounds was studied by TRLIF and steady-state emission intensity measurements. The results were interpreted in terms of binding of phenolic compounds to the micelle. The binding constant (KQ) as well as the entrance and exit rate constants were determined for all the quenchers used.