Spectrophotometric reaction-rate method for the determinatoin of sulfide by catalytic action on the oxidation of sodium azide iodine

RecordNumber :

199

Doc. No. :

249A

Call. No. :

249A

Author :

Ensafi, ali A.,Samimifar, M

Title of Article :

Spectrophotometric reaction-rate method for the determinatoin of sulfide by catalytic action on the oxidation of sodium azide iodine

Title Of Periodical :

ANALYTICAL LETTERS

VolumNumber :

V.27

Date :

(1994)

Page :

P.153-167

Descriptors :

Catalytic,Azide,Iodine,Sulfide,Water,Steel

Abstract :

catalytic kinetic method has been used for the determination of ultra trace amounts of total dissolved sulfide based on its catalytic effect on the reaction between sodium azide and iodine in aqueous solution. Sulfide over the range of 0.020-0.500 Mg.ml**-1 was determined spectrophotometrically by measuring the decrease in absorbance of iodine at 348 nm by the fixed-time method. The decrease in absorbance during the first 0.5-3.0 min from initiation of the reaction is related to the concentration of sulfide. The detection limit is 0.010 Mg.ml**-1. The relative standard deviation for the determination of 0.050 Mg.ml**-1 of sulfide was 2.2,. The proposed method was successfully applied for the determination of sulfide in synthetic samples , spring water and of sulfur in steel.

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