Kinetic-Photometric Determination of Iodide Based on Its Inhibitory Effect on the Bromate Oxidation of Victoria Blue 4-R

Mitić, Violeta; Nikolić, Snežana D.; Stаnkov-Jovаnović, Vesnа

doi:10.2116/analsci.20.931

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…The 1•10 -4 mol dm -3 stock solution of Victoria blue (Fluka AG, Buchs SG colour index (CI) number 42563, c.i. name Basic Blue 8, structure published [13]) was prepared by dissolving 0.0130 g VB in adequate volume of absolute ethanol. The concentration of solution was checked spectrophotometrically.…”

Section: Reagents and Chemicalsmentioning

confidence: 99%

Analytical application of acidic victoria blue 4R mixture with KBrO<sub>3</sub> for the kinetic determination of traces of antimony(III) by spectrophotometry

Mitić

Nikolic-Mandic

Stаnkov-Jovаnović

2012

Maced. J. Chem. Chem. Eng.

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The present paper describes a simple, selective and sensitive kinetic method for the determination of trace amounts of Sb(III) in the presence of Sb(V) based on its inhibition effect on the redox reaction between bromate and Victoria blue 4R (V.B. 4-R) in hydrochloric acid media. The reaction was followed spectrophotometrically by measuring the decrease in the absorbance of V.B. 4-R at 596.3 nm. Optimum operating conditions regarding reagent concentrations were established. The optimized conditions yielded a theoretical detection limit of 1.30·10‒8 g cm–3 Sb(III) based on the 3S0 criterion. The method allows the determination of Sb(III) in the range of 5·10‒8 ‒ 1.1·10‒6 g cm–3. The effects of certain foreign ions the reaction rate were determined for an assessment of the selectivity of the method. The kinetic parameters of the reaction were reported, and the rate equations were suggested. The results were validated statistically and through recovery studies. The proposed method has been successfully applied to the determination of Sb(III) in various model and real samples.

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Section: Reagents and Chemicalsmentioning

confidence: 99%

Analytical application of acidic victoria blue 4R mixture with KBrO<sub>3</sub> for the kinetic determination of traces of antimony(III) by spectrophotometry

Mitić

Nikolic-Mandic

Stаnkov-Jovаnović

2012

Maced. J. Chem. Chem. Eng.

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Sensitive Flow-Injection Amperometric Detection of Iodide Using Mn3+ and As3+

Nikolić¹,

Mutić²,

Lolić³

et al. 2005

ANAL. SCI.

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Iodide is an essential micronutrient in the human body. Therefore, it is of great interest to have a reliable analytical method for the control of its content in food and biological materials.There are numerous reports in the available literature related to the application of flow-injection methods for determination of iodide with different ways of detection. The methods include spectrophotometric iodide detections, 1 indirect flow-injection method with FAAS 2 (flame atomic apsorption spectrometry), flow-injection analysis and atomic absorption spectrometry with the on-line preconcentration, 3 chemiluminescent detection. 4 The FI (flow injection) method issued for determination of iodide ion in photograph developers using an iodide ionselective detector. 5 Iodide amounts can be estimated by FIA (flow injection analysis) methods as well, using permeable membranes. 6,7 A high selectivity was achieved by the involvement of gas-diffusion and dialysis in a FIA system. In the above-mentioned methods, the effect of interfering substances is rather low, but the LODs are higher than in direct FIA methods. Ion chromatography has been successfully applied for determination of iodide in seawater samples. 8 Also, anode or cathode stripping voltammetry were frequently employed for iodide determination after preconcentration of the samples containing either iodide or iodine and the application of a carbon-paste electrode or a chemically modified carbon-paste electrode. 9 Kinetic methods for the determination of iodide based on its catalytic effect have been widely used. [10][11][12] Pastor et al. [13][14][15] examined spectrophotometrically the kinetics of the reaction of Mn 3+ with As 3+ in the presence of sulfuric 13,14 or orthophosphoric 16 acid and iodide as a catalyst. The detection limit of 0.72 ng/L and RSD of up to 6% was achieved for iodide determination in sulfuric acid media. 13 The method was applied on determination of iodide content in some oximes that are used as antidotes for nervous gas poisoning. 14 The linear range was 1.0 × 10 -8 -8.0 × 10 -8 mol/L and for 2-[(hydroxyimino)methyl]-1-methylpyridinium iodide (2-PAM iodide) the limit of detection was 0.5 ng/mL (relative standard deviation of up to 9.1%). For iodide determination in phosphorous acid media 16 under the optimal experimental conditions in the range 0.6 -2.5 ng/mL, a relative standard deviation of up to 6.7% and a detection limit of 0.12 ng/mL was achieved.In the work of Cheng and Hibbert, 16 amperometric and potentiometric detection was applied for iodide determination on a platinum electrode at +0.9 V versus Ag/AgCl electrode. The obtained detection limit is 1.0 × 10 -6 mol/L, RSD is 2.0% for iodide concentration 1.0 × 10 -4 mol/L and the linear range is 1.0 × 10 -6 -1.0 × 10 -3 mol/L. In the system applied throughout the present study, iodide injected into the carrier flow catalyzes the reaction of Mn 3+ with As 3+, and the signal intensity, proportional to iodide concentration either in standard solution or in the sample, appears at the working...

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The development of a new inhibition kinetic spectrophotometric method for the determination of phenylhydrazine

2005

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Anew sensitive kinetic method has been developed for the determination of trace amounts of phenylhydrazine in the range of 1.08x10-7 to 1.08x10-6 g/cm3. The detection limit of this method is 0.008 ?g/cm3, based on the 3Sb criterion. Themethod is based on the inhibitory effect of phenylhydrazine on the oxidation of Victoria Blue 4-R by KBrO3. The reaction was monitored spectrophotometrically at 596.3 nm. The method development includes the optimization of the reagent concentration and temperature. The kinetic parameters of the reaction are reported and a rate equation is suggested. The effects of certain foreign ions upon the reaction rate were determined for the assessment of the selectivity of the method. The new developed method was found to have fairly good selectivity, sensitivity, simplicity and rapidity.

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Kinetic-Photometric Determination of Iodide Based on Its Inhibitory Effect on the Bromate Oxidation of Victoria Blue 4-R

Cited by 4 publications

References 22 publications

Analytical application of acidic victoria blue 4R mixture with KBrO<sub>3</sub> for the kinetic determination of traces of antimony(III) by spectrophotometry

Analytical application of acidic victoria blue 4R mixture with KBrO<sub>3</sub> for the kinetic determination of traces of antimony(III) by spectrophotometry

Sensitive Flow-Injection Amperometric Detection of Iodide Using Mn3+ and As3+

The development of a new inhibition kinetic spectrophotometric method for the determination of phenylhydrazine

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