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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Iodized

Classification: Food -> table salt -> iodized

Citations 3

"Indirect Automatic Determination Of Iodide By Flame Atomic Absorption Spectrometry"
Anal. Chim. Acta 2000 Volume 405, Issue 1-2 Pages 191-196
M. C. Yebra and R. M. Cespón

Abstract: A continuous flow procedure is proposed for the indirect determination of iodide based on its reducing properties. Chromium(VI) in acid medium was injected into an iodide stream, and Cr(VI) was reduced to Cr(III). This Cr(III) formed was retained on-lint, proportionally to the iodide in the sample, on a poly(aminophosphonic acid) (PAPhA) chelating resin, which is selective only for this oxidation state, while non-reduced Cr(VI) was determined by flame atomic absorption spectrometry (FAAS). The proposed method allows the determination of iodide in the range 0.6-25 µg mL-1 with a relative standard deviation of 2.5% at a rate of ~80 samples per hour. This method has been applied to the determination of iodide in iodized table salt.
Iodide Spectrophotometry Indirect Preconcentration Chelation

"Incorporation Of A Coated Tubular Solid-state Iodide Selective Electrode Into The Conduits Of A Flow Injection System"
Fresenius J. Anal. Chem. 1986 Volume 325, Issue 3 Pages 247-251
Jacobus F. van Staden

Abstract: A tubular flow-through electrode (5 mm long, 2 mm i.d.) prepared by depositing AgI on silver foil and connected to an Orion Research microprocessor Ionalyzer with an Orion double-junction reference electrode was incorporated in a flow injection system (diagram given) capable of 90 samples h-1. Samples and ionic-strength-adjustment buffer were fed by a peristaltic pump with a pulse suppression system. Optimum sensitivity and response were obtained with 0.1 M KNO3 - 0.02 M acetic acid buffer. Response of carefully conditioned electrodes was rectilinear from 5 to 5000 mg L-1 of I-; they were stable and needed little maintenance. Analyses of iodized table salt agreed reasonably with quoted I- concentration, with a coefficient of variation of <1.8% (n = 15). The practical range was 5 to 2000 mg l-1.
Iodide Electrode Potentiometry Apparatus Computer Optimization Pulse dampener Ionic strength Buffer

"Determination Of Iodide Using Flow Injection With Acidic Potassium Permanganate Chemiluminescence Detection"
Luminescence 2006 Volume 21, Issue 4 Pages 221-225
Mohammad Yaqoob*, Atiq-ur-Rehman, Amir Waseem, Abdul Nabi

Abstract: A simple and rapid flow-injection method is described for the determination of iodide, based on potassium permanganate chemiluminescence detection via oxidation of formaldehyde in aqueous hydrochloric acid. The calibration graph was linear over the range 1.0-12 x 10^-6 mol/L (r2 = 0.9955) with relative standard deviations (n = 4) in the range 1.0-3.5%. The detection limit (3) was 1.0 x 10^-7 mol/L, with sample throughput of 120/h. The effect of interfering cations [Ca(II), Mg(II), Ni(II), Fe(II), Fe(III) and Pb(II)] and anions (Cl-, SO42-, PO43-, NO3-, NO2-, F- and SO32-) were studied. The method was applied to iodized salt samples and the results obtained in the range 0.03 ± 0.005-0.10 ± 0.006 mg I/g were in reasonable agreement with the amount labelled. The method was statistically compared with the results obtained by titration; no significant disagreement at 95% confidence was observed.
Iodide Chemiluminescence Method comparison Interferences