Catalytic Dynamic Spectrofluorimetry Determination of Trace Tin Using New Type Arsenoxylphenylazo Rhodanine

A new catalytic dynamic spectrofluorimetry method is proposed for determination of trace tin which is based on the reaction between potassium periodate and the new type fluorescent reagent 3-m- chlorophenyl-5-(2´- arsenoxylphenylazo) rhodanine (3CIRAAP). The fluorescence intensity is investigated to be sharply quenched by the oxidation of 3-m-chlorophenyl-5- (2´-arsenoxylphenylazo) rhodanine by potassium periodate with tin as catalyst in the buffer medium of potassium hydrogen phthalate-sodium hydroxide(pH = 5.2). Under the optimum conditions the great quenchment of fluorescence intensity has a linear relationship against the concentration of tin in the range of 0.02 to 10 mug ldr L^-1 with a detection limit of 2.25 times 10^-10 gldrmL^-1. This proposed method led to the satisfied determination of tin in real samples.