Free Access
Volume 28, Number 3, April 2000
Page(s) 253 - 256
Section Original articles
Analusis 28, 253-256 (2000)
DOI: 10.1051/analusis:2000117

A rapid and simple fluorimetric determination of iodide in iodized table salts

V. A. Kabasakalis and M. G. Mitrakas

Lab. of Analytical Chemistry, Chemical Engineering Department, Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki 54006, Greece

(Received January 4, 2000; revised March 21, 2000; accepted March 23, 2000.)

A new, simple and rapid fluorimetric method is proposed for the determination of iodide in iodized table salts based on the fluorescence exhibited by the ionic complex formed between AgI2- and the brilliant green cation (ë $_{\rm exc}=256$ nm, ë $_{\rm em}=521$ nm) at pH 3.0 and Ag+ concentration of 0.8 mg/L. The relationship between fluorescent response expressed as Fluorescence Intensity Units (FIU) and KI concentration of standards in 20 g NaCl/L was linear in the range of 0.15 to 1.2 mg KI/L. The sensitivity of the method was 300 FIU for 1 mg KI/L with a detection limit of 0.15 mg KI/L. The proposed method was applied in commercial iodized table salts and the results obtained were correlated closely to those obtained by the official method of the AOAC.

Key words: Iodide determination -- table salt -- fluorimetry.

© EDP Sciences, Wiley-VCH 2000