Kinetic spectrophotometric determination of trace amounts of nitrite ion using potassium bromate-murexide mixture in acidic media

Abstract

A new, simple, rapid, and cheap method for determination of trace amounts of nitrite ion is reported.<br />Determination is based on reduction of bromate ion by nitrite ion, in the presence of murexide in<br />acidic media. During reaction of bromate ion with nitrite ion, the reaction mixture is decolorized.<br />The absorbance changes is then monitored spectrophotometricaly at 520 nm, at 25 °C. Dynamic<br />range of calibration curve for nitrite ion is in the range of 1-22 ig.mL 1 . The effect of interfering<br />ions was investigated. This method was successfully used for determinination of nitrite ion<br />concentration in sausages.