Determination of Nitrite by Catalytic Kinetic Photometry with Surfactant Sensitizer / 分析化学

ABSTRACT

A catalytic kinetic photometric method for the determination of nitrite with surfactant sensitizer has been developed. The method is based on the catalysis of NO2- to the discoloring reaction of pyronine B oxidized by potassium bromate in the solution of dilute H3PO4. When cetylpyridine bromide was used as a sensitizer of the reaction, the sensitivity increased by 2.5 times approximately. There was linear relationshop of lg(Ao/A) with nitrite in the range 0.005 ～ 0.15 mg/L. The detection limit was 0.004 mg/L. The method was used in the determination of trace nitrite in water and vegetable samples with satisfactory results.