Catalytic-Kinetic Spectrophotometric Deterimnation of Trace Nitrite with a System of Potassium Bromate Redox Phenosafranine Reaction

A new catalytic spectrophotometric method for determining trace nitrite has been developed.This is based on a nitrite-catalyzed redox reaction between phenosafranine and potassium bromate in sulphuric acid. The linear range of the method is 0.36～0.56μg/mL, the detection limit is and has a good selectivity. The method has been applied to the determination of trace nitrite in rain water samples, the relative standlard deviation is 2.8%～3.5%, the recovery efficiency is 98%～102% and results are satisfactory.