Spectrophotometric reaction rate method for the determination of nitrite by catalytic action on nile blue a bromate reaction

RecordNumber :

198

Doc. No. :

207A

Call. No. :

207A

Author :

Ensafi, A. A.,Naghizadeh, M

Title of Article :

Spectrophotometric reaction rate method for the determination of nitrite by catalytic action on nile blue a bromate reaction

Title Of Periodical :

JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN

VolumNumber :

V.6, No.4

Date :

(1995)

Page :

P.215-220

Descriptors :

Catalytic,Nitrite,Spectrophotometric,Water

Abstract :

Kinetic method developed for the determination of ultra-trace amounts of nitrite based on its catalytic effect on the reaction between potassium bromate and Nile blue A in strongly acidic media is reported. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of Nil blue A at 645 nm by the fixed-time method. The decrease in absorbance during the first 0.5-3.0 min of the reaction is related to the concentration of nitrite in the of 0.002-0.500 MG.ml**-1. The deetection limit of 0.001 Mg.ml**-1 was achieved for the nitrite ion. The relative standard deviation for 0.0100 Mg.ml**-1 nitrite is 1.0,.Most common anions and cations did not interfere in the measurement. The procedure was successfully applied for the determination of nitrite in natural water and salt.

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