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Abstract
A fluorimetric procedure for Ag+ determination in aqueous solutions was developed based on the ion association complex formed from the reaction between AgI- 2 and the brilliant green cation and its strong fluorescence (λexc 256 nm, λem 521 nm). Silver ions could be determined satisfactorily in the range of 0-100 μgAg+/L. Optimum conditions for complex formation and measurement of fluorescence intensity 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 solutions and the results agreed satisfactorily with those obtained using a standard Atomic Absorption Spectrometry method.
Notes
American National Standards Institute, New York, ANSI PH 4, 33 (1969).