Kinetic spectrophotometric determination of low levels of nitrite by catalytic reaction between pyrogallol red and bromate

Authors: Ali A Ensafi, M Samimifar

Publication date: 1993/9/30

Journal name: Talanta

Volume: 40

Pages: 1375-1378

Publisher: Elsevier

Abstract A kinetic spectrophotometric method for the determination of trace nitrite (0.003–
1.000 μg/ml) based on its catalytic effect on the reaction between potassium bromate and
pyrogallol red in acidic media is described. The reaction is monitored spectrophotometrically
by measuring the decreasing colour of pyrogallol red at 467 nm by the fixed-time method. At
a given time of 3.0 min at 30, the detection limit is 0.001 μg/ml and the relative standard
deviation for 0.010 μg/ml nitrite is 1.8%(n= 8). The method is free from most interferences, ...