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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Food

Classification: Food -> table salt

Citations 6

"Sensitive Flow-Injection Amperometric Detection Of Iodide Using Mn3+ And As3+"
Anal. Sci. 2005 Volume 21, Issue 5 Pages 525-529
Snezana D. NIKOLIC, Jelena J. MUTIC, Aleksandar D. LOLIC, and Dragan D. MANOJLOVIC

Abstract: A rapid, selective, and sensitive kinetic flow-injection method for iodide content determination with amperometric detection on a platinum electrode was developed. The method is based on the catalytic effect of iodide on the Mn3+ reaction with As3+ in the presence of sulfuric acid. The calibration curve was linear in the concentration range from 5.0 x 10^-7 to 1.0 x 10^-4 mol/L iodide. The limit of detection (LOD) was found to be 5.0 x 10^-9 mol/L iodide. The relative standard deviations (RSD) were 1.68% and 3.03% for 1.0 x 10^-3 mol/L standard and 1.0 x 10^-6 mol/L iodide solution (n = 6), respectively. The method has been successfully applied for determination of iodide in waters, table salts, fodder, organic substances and human blood sera. The results were compared with those obtained by a standard AOAC (Association of Official Analytical Chemists) method, as well as with those obtained by a kinetic spectrophotometric procedure for determination of iodide.
Iodide Amperometry Electrode Method comparison Interferences Catalysis

"Spectrophotometric Flow Injection Determination Of Trace Iodide In Table Salt And Laver Through The Reaction Of Iodate With 3,5-Br2-PADAP And Thiocyanate"
Fresenius J. Anal. Chem. 1997 Volume 357, Issue 7 Pages 1002-1005
Junying Sun, Xingguo Chen, Zhide Hu

Abstract: Cleaned, dried laver (2 g) was mixed with 10 mL 2 M KOH, dried at 80-100°C for 1-2 h, charred for 2-3 h, ashed for 4-5 h and the residue was dissolved in water with heating. A portion (10 ml) of prepared solution of 0.4 mg/ml table salt solution was mixed with 1 mL H3PO4 solution and 1 mL saturated Br2 solution, the mixture was heated to remove Br2 and then diluted to 50 mL with water. Portions (100 µL) were injected into a water stream (0.8 ml/min) which merged with a stream (0.8 ml/min) of 0.004% 2-(3,5-dibromo-2-pyridylazo)-5-diethylamino-phenol (3,5-Br2-PADAP) in 4.5 M H2SO4, passed through a mixing coil (12 cm x 0.5 mm i.d.), merged with a stream (0.8 ml/min) of 10 mM KSCN and passed through a reaction coil (90 cm x 0.5 mm i.d.) prior to detection at 605 nm. Beer's law was obeyed from 1-24 µM-iodide, the detection limit was 0.5 µM and recoveries were 98-104%. RSD are not stated. The sample throughput was 80/h. The tolerance levels of various interferents were determined (results presented). The reaction mechanism is discussed.
Iodide Spectrophotometry Interferences

"Flow Injection Analysis Of Iodide In Table Salt"
Biotekhnol. Khim. 1989 Volume 1, Issue 8 Pages 21-22
Ilcheva, L.K.;Kaman, K.;Georgieva, T.

Abstract: Iodide is determined in table salt by flow-injection potentiometric anal. with a Pt electrode. The method compared favorably with a spectrophotometric method, as it could be used in cases where spectrophotometry would be difficult. The standard deviation was 0.14% with the potentiometric method, which is recommended for use when I levels in the salt are 20-100 mg (KI)/kg. (SFS)
Iodide Potentiometry Method comparison

"Determination Of Iodide By A Flow Injection - Online Oxidation - Inductively Coupled Plasma Atomic-emission Spectrometry System"
Fenxi Huaxue 1996 Volume 24, Issue 3 Pages 288-291
Wang, H.N.;Shang, F.Q.

Abstract: Portions (300 µL) of standard iodide (I) solution were injected into a flow injection system (schematic shown) and transported at 1.6 ml/min by a carrier stream of water to a hydride generation device and treated with 6 M HNO3. The volatile iodine formed was detected by ICP-AES at 178.28 nm. The detection limit was 0.04 mg/l of I. Interference from NaCl was tolerated up to 20 g/l and up to 100 mg/l for eighteen (listed) common interfering ions. The method was applied to the analysis of I in cooking salt with RSD of 3-3.2%.
Iodide Spectrophotometry Interferences Volatile generation Redox Volatile generation

"Spectrophotometric Determination Of Trace Iodide By Flow Injection Analysis"
Fenxi Huaxue 1996 Volume 24, Issue 6 Pages 720-723
Wang, P.;Shi, S.J.

Abstract: Portions of standard iodide (I) solution were injected into a flow injection analyzer. (schematic shown) and treated with a mixture of 1% bromine and 2% H3PO4 in water in a reaction coil (5 cm x 0.7 mm i.d.). The mixed solution was treated with aqueous 6% sulfosalicylic acid in a second coil (94 cm x 0.7 mm i.d.) and the absorbance of the colored product formed was measured at 580 nm. The calibration graph was linear up to 1 mg/l I. The RSD was 3.3%. Sampling frequency was 80 runs per h. There was little interference. The method was applied to the analysis of iodine-containing tablets, table salt, animal feed and kelp, with recovery of 90-97.5%.
Iodide Spectrophotometry Interferences

"Determination Of Iodide In Table Salt By Flow Injection Analysis Using Pyrocatechol Violet"
Food Chem. 1993 Volume 46, Issue 1 Pages 95-99
A. Cerdà, R. Forteza and V. Cerdà*

Abstract: A spectrophotmetric flow injection method for the determination of iodide based on the catalytic effect on this ion on the oxidation of pyrocatechol violet by potassium persulphate was developed. The method allows the determination of 0.5-5 mg litre-1 iodide at a rate of 60 samples per hour and is subject to very few interferences. It was succesfully applied to the determination of iodide in table salt.
Iodide Spectrophotometry Catalysis Interferences