FLUOROMETRIC KINETIC-FIA DETERMINATION OF AG(I) BASED ON ITS CATALYTIC EFFECT ON THE REDUCTION REACTION OF SAFRANINE WITH IODIDE

A sensitive kinetic fluorimetric flow injection method has been develo ped for the determination of Ag(I) over the range 100-2500 ng. The met hod is based on the catalytic effect of Ag(I) on the reduction reactio n of safranine by iodide. Method development includes optimization of reagent concentration, pH, reaction temperature, and flow variables. T he optimized flow injection manifold yielded a detection limit of 50 n g of Ag(I). Chemical interference studies showed that the method also has good selectivity. The method was applied to the determination of s ilver in expired black and white photographic film. (C) 1998 Academic Press.