Rapid chemiluminescence method for the determination of iodate traces

Zuĭ, O. V.; Terletskaya, A. V.

doi:10.1007/bf00321640

Cited by 31 publications

(10 citation statements)

References 6 publications

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“…The recommended concentration of the iodate in the salts is 40 ppm. 2 Several methods have been reported on the determination of iodate, such as gas chromatography-mass spectrometry, 3 ion chromatography, 4 chemiluminescence, 5 flow injection amperometry 6 and spectrophotometry. [7][8][9][10][11] Some reported spectrophotometric methods for the determination of iodate are based on its reaction with excess iodide to form triiodide.…”

Section: Introductionmentioning

confidence: 99%

Sensitive Kinetic-Spectrophotometric Determination of Iodate in Iodized Table Salt Based on Its Accelerating Effect on the Reaction of Bromate with Chloride Ion in the Presence of Hydrazine

Afkhami

Mosaed

2002

ANAL. SCI.

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Iodine is an essential part of the thyroid hormones that play an important role in the development of brain function and cell growth.Deficiency of iodine causes serious delay in neurological development. On the other hand, an excess of iodine or iodide can cause goiter and hypothyroidism as well as hyperthyroidism. 1 Table salts are iodized by iodate as a source of iodine, in order to prevent iodine deficiency. The recommended concentration of the iodate in the salts is 40 ppm. 2Several methods have been reported on the determination of iodate, such as gas chromatography-mass spectrometry, 3 ion chromatography, 4 chemiluminescence, 5 flow injection amperometry 6 and spectrophotometry. [7][8][9][10][11] Some reported spectrophotometric methods for the determination of iodate are based on its reaction with excess iodide to form triiodide. [7][8][9] In other spectrophotometric methods, iodate was determined after prior oxidation to periodate. 10,11 The ion-associate of periodate with a suitable ion pairing agent was then extracted into an organic solvent and determined by spectrophotometric methods. Most of the proposed methods are either not sensitive enough, or require complicated and expensive instruments, or are timeconsuming, or provide high detection limits. The need for a sensitive, simple and reliable method for the determination of iodate is therefore clearly recognized.This paper describes a kinetic-spectrophotometric method for the determination of trace quantities of iodate based on its accelerating effect on the reaction of bromate with chloride in the presence of hydrazine in acidic media. Experimental ReagentsAll solutions were prepared using reagent grade substances and triply distilled water.The standard solution (1000 µg ml -1 ) of iodate was prepared by dissolving 0.3100 g sodium iodate (Merck) in water and diluting to the mark in a 250 ml volumetric flask. A solution of 0.02 M hydrazine was prepared by dissolving 0.5248 g of hydrazine dihydrochloride (Merck) in water and diluting to the mark in a 250 ml volumetric flask. A 0.10 M potassium bromate solution was prepared by dissolving 1.770 g of KBrO3 (Merck) in water and diluting to 100 ml in a volumetric flask. A solution of 3.05 × 10 -4 M Methyl Orange was prepared by dissolving 0.01 g of Methyl Orange (Merck) in water and diluting to 100 ml with water. A 2.0 M sodium chloride solution was prepared by dissolving 11.686 g NaCl (Merck) in water and diluting to the mark in a 100 ml volumetric flask. Sulfuric acid solution (2 M) was prepared by appropriate dilution of concentrated sulfuric acid (Merck). ApparatusA Shimadzu Model UV-120-01 spectrophotometer with a l-cm glass cell was used for absorbance measurements. ProcedureAll the solutions were equilibrated at 30±0.1˚C before the beginning of the reaction.The reaction was followed spectrophotometrically by monitoring the change in absorbance at 525 nm. A suitable aliquot of a standard solution containing 0.3 -12 µg of iodate was transferred into a 10-ml volumetric flask containing 1 ml of 1.56 ×...

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Section: Introductionmentioning

confidence: 99%

Sensitive Kinetic-Spectrophotometric Determination of Iodate in Iodized Table Salt Based on Its Accelerating Effect on the Reaction of Bromate with Chloride Ion in the Presence of Hydrazine

Afkhami

Mosaed

2002

ANAL. SCI.

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“…Iodate is also present in sea water and is in the range 0-60 µg L -1 [3]. Several methods have been reported for the determination of iodate, such as GC-MS [4], ionchromatography [5], chemiluminescence [6], flow injection-amperometry [7], potentio-metric titrations [8], differential pulse-polarographic method [9] , spectroflurometry [10], flow injectionspectrophotometry [11][12], coulometry [13], photometric analysis [14][15][16] and gravimetric method [17]. Some reported spectrophotometric methods for the determination of iodate are based on its reaction with excess iodide to liberate iodine which forms tri-iodide [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

<b>SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF IODATE USING METHYLENE BLUE AS A CHROMOGENIC REAGENT</b>

Narayana

Pasha

Cherian

et al. 2006

Bull. Chem. Soc. Eth.

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ABSTRACT.A simple, rapid and sensitive spectrophotometric method has been developed for the determination of iodate (IO3 -) in table salt and sea water. The proposed method is based on the reaction of iodate with potassium iodide in an acid medium to liberate iodine. The liberated iodine bleaches the blue color of methylene blue and is measured at 665.6 nm. This decrease in absorbance is directly proportional to the iodate concentration and obeys Beer's law in the range of 0.5-14 µgmL -1 of IO3 -. The molar absorptivity, Sandell's sensitivity, detection limit and quantitation limit of the method were found to be 1.24 x 10 4 Lmol -1 cm -1 , 1.41 x 10 -2 µgcm -2 , 0.048 µgmL -1 and 0.145 µgmL -1 , respectively. The optimum reaction conditions and other analytical conditions were evaluated. The effect of interfering ions on the determination has been described. The proposed method has been successfully applied to the determination of the iodate in the table salt and sea water.

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“…Several techniques have been applied for the determination of iodate, including chromatography coupled with spectrophotometry or mass spectrometry, chemiluminescence, and amperometry. [22][23][24][25][26][27] For the ease of preparation, fast response, cost saving, and simple operation, which are crucial for sensing applications, in this work the Keggin-type molybdophosphate anion, α-PMo12O40 3-(α-PMo12 for short), film assembled on cholinemodified GCE (α-PMo12/Ch/GCE), is reported. We discuss its fabrication and characterization and present a preliminary investigation of catalytic behavior toward IO3 -reduction.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Molybdophosphate on a Glassy Carbon Electrode Covalently Modified with Choline and Electrocatalytic Reduction of Iodate

Lin

Jiang

2006

ANAL. SCI.

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Choline can be covalently grafted on glassy carbon electrodes using cyclic voltammetric method, forming a stable cationic monolayer-modified electrode (Ch/GCE). Keggin-type molybdophosphate anions, α-PMo12O40 3-, then were selfassembled on the Ch/GCE through electrostatic interactions for fabrication of an electrochemical sensor, which is denoted as α-PMo12/Ch/GCE. This two-layer modified electrode was carefully characterized by cyclic voltammetry and X-ray photoelectron spectroscopy. It was found that the sensor exhibits strong electrocatalytic activity and sensitivity toward the reduction of IO3-. The content of IO3 -in a table salt was determined with satisfactory results. The sensor is promising as an electrochemical sensor for the detection of IO3 -.

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Rapid chemiluminescence method for the determination of iodate traces

Cited by 31 publications

References 6 publications

Sensitive Kinetic-Spectrophotometric Determination of Iodate in Iodized Table Salt Based on Its Accelerating Effect on the Reaction of Bromate with Chloride Ion in the Presence of Hydrazine

Sensitive Kinetic-Spectrophotometric Determination of Iodate in Iodized Table Salt Based on Its Accelerating Effect on the Reaction of Bromate with Chloride Ion in the Presence of Hydrazine

<b>SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF IODATE USING METHYLENE BLUE AS A CHROMOGENIC REAGENT</b>

Self-Assembly of Molybdophosphate on a Glassy Carbon Electrode Covalently Modified with Choline and Electrocatalytic Reduction of Iodate

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