Abstract
The catalytic effect of nitrite on the oxidation of phenosafranine by bromate in acidic medium was studied by using the decrease in fluorescence intensity of phenosafranine. This kinetic—spectrofluorimetric method for nitrite is linear over the range 0.9–13.8 ng ml −1 with a relative standard deviation of about 1.5%. The method can be successfully adapted to flow-injection analysis in the stopped-flow mode. Manual and flow-injection methods were satisfactorily applied to the determination of nitrite in waters and meat products. The inclusion of a copperized cadmium column in the flow system allows the determination of nitrate and the sequential determination of nitrate and nitrite in mixtures.
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