FLUOROMETRIC-DETERMINATION OF SILVER WITH BRILLIANT GREEN IN AQUEOUS SYSTEMS AND ITS APPLICATION IN PHOTOGRAPHIC FIXING SOLUTIONS

A fluorimetric procedure for Ag+ determination in aqueous solutions wa s developed based on the ion association complex formed from the react ion between AgI2- and the brilliant green cation and its strong fluore scence (lambda(exc) 256 nm, lambda(em) 521 nm). Silver ions could be d etermined satisfactorily in the range of 0-100 mu gAg(+)/L. Optimum co nditions for complex formation and measurement of fluorescence intensi ty were : pH=3.0; concentrations of brilliant green and KI, 15 and 100 mg/L, respectively; time, within 15 min after complex formation. The method proved successful in determing Ag+ in photography fixing soluti ons and the results agreed satisfactorily with those obtained using a standard Atomic Absorption Spectrometry method.