Abstract

NOVEL COLORIMETRIC METHOD FOR ESTIMATION OF IODATE ION IN TABLE SALT SAMPLES

Nief Rahman Ahmed* and Noor Mazin Ibrahim

Abstract

A simple, rapid and accurate spectrophotometric method has been developed for the determination of iodate ion using trifluoperazine. The proposed method reports the reaction of iodate ion with trifluoperazine in acidic medium to form a red colored product with an absorption maximum at 500 nm. Beer’s Law was obeyed in the range of 0.2-2.8μg/ml with molar absorptivity 4.08x104 L.mol.-1. cm-1. The relative standard deviation of the method was less than 2% and accuracy (average recovery) was 100±1.3%. The optimum conditions for all color development are described and the proposed method has been successfully applied for the determination of iodate ion in table salt samples.

Keywords: Iodate, Spectrophotometric, table salt samples.