University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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IAEA A-11

Classification: Reference Material -> IAEA -> A-11 -> Milk powder

Citations 1

"Flow Injection Spectrophotometric Catalytic Determination Of Iodine In Milk"
Anal. Sci. 1998 Volume 14, Issue 3 Pages 559-564
Ana Rita de Araujo NOGUEIR), Fabiana MOCKIUTI), Gilberto Batista de SOUZ) and Odo PRIMAVESI

Abstract: A flow injection method based on the catalytic action of iodide on the color-fading reaction of the FeSCN2+ complex was proposed and applied to the determination of iodine in milk. At pH 5.0, temperature 32°C and measurements at 460 nm, the decrease in absorbance of Fe(III)-SCN (0.10 and 0.0020 mol L-1) in the presence of NO2- (0.3 mol L-1) is proportional to the concentration. of iodide, with linear response up to 100.0 µg I- L-1. The detection limit was determined as 0.99 µg I- L-1 (3s blank/slope); and the system handles 48 samples h-1. Organic matter was destroyed by a dry procedure carried out under alkaline conditions. Alternatively, the use of Schoeninger combustion after milk dehydration was evaluated. The residue was taken up in 0.12 mol L-1 KOH solubilization. For typical samples, recoveries varied from 94.5 to 105%, based on the amounts of both organic matter destroyed. The accuracy of the method was established by using a certified reference material (IAEA A-11, milk powder) and a manual method.
Iodine Spectrophotometry Reference material Method comparison Indirect