Use of pseudo-first order kinetics in flow injection for determination of trace inorganic iodine

Choengchan, Nathawut; Lukkanakul, K; Ratanawimarnwong, Nuanlaor; Waiyawat, Weerawan; Wilairat, Prapin; Nacapricha, Duangjai

doi:10.1016/j.aca.2003.08.062

Cited by 20 publications

(22 citation statements)

References 12 publications

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“…The values for mineral and seawater and table salt samples are in good agreement with those obtained by the FIA method 35 and label (Table 2). From these results, the method seems to be applicable to determination of iodide in real samples.…”

Section: Determination Of Iodide In Mineral Waters and Table Saltsupporting

confidence: 77%

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

2004

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A new sensitive kinetic method has been developed for the determination of trace amounts of I -over the range of 50 -300 ng cm -3 . The method was based on the inhibitory effect of iodide on the oxidation of Victoria Blue 4-R by KBrO3. The reaction is monitored spectrophotometrically at 596.3 nm. Method development includes optimization of reagent concentration and temperature. The kinetic parameters of the reaction were reported and a rate equation was suggested. The effects of certain foreign ions upon the reaction rate were determined for the assessment of the selectivity of the method. The proposed method was successfully applied to the determination of iodide in real samples. The new developed method was found to have fairly good selectivity, sensitivity, simplicity and rapidity.

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Section: Determination Of Iodide In Mineral Waters and Table Saltsupporting

confidence: 77%

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

2004

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“…As(III) has been used as the reducing agent as it is already a component of the Sandell-Kolthoff reaction. 18,21,25,26 In this work, a simple microfluidic method employing the Sandell-Kolthoff reaction, with front-face fluorometric detection of Ce(III) in the stopped-flow mode, was developed for the determination of inorganic iodine in natural drinking water. The developed microfluidic platform is convenient for attachment of fiber-optics for fluorometric detection and reduction of toxic reagents consumption.…”

Section: Introductionmentioning

confidence: 99%

“…Measurement of iodine content in various sample matrices including pharmaceuticals, [13][14][15] urine, 10,[16][17][18][19] seawater specimens, 15,22 iodized salts, 10,20 plant, 9 and drinking water. 14,21 Most of these methods utilized the Sandell-Kolthoff reaction 24 in which iodide catalyzed the redox reaction between Ce(IV) and As(III) due to its sensitivity for detection of very low levels of iodide (parts per billion) (see Table 1). Iodate ion is also present in water samples.…”

Section: Introductionmentioning

confidence: 99%

“…There are a variety of methods reported in the literature for measurement of trace iodine. 7 These methods are based on principles such as electrochemistry, [8][9][10] separation techniques, 11 chemiluminescence, 12,13 spectrophotometry [14][15][16][17][18][19][20][21] and spectrofluorometry. 22 Although conventional ICP techniques 23 have been employed for iodine measurement, it requires high-cost instrumentation, high maintenance costs, with low sample analysis throughput.…”

Section: Introductionmentioning

confidence: 99%

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Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

et al. 2018

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A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO3 -and I -) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine. On-line conversion efficiency of iodate to iodide using the microfluidic device was investigated. Excellent conversion efficiency of 93 -103% (%RSD = 1.6 -11%) was obtained. Inorganic iodine concentrations in drinking water samples were measured, and the results obtained were in good agreement with those obtained by an ICP-MS method. Spiked sample recoveries were in the range of 86%(±5) -128%(±8) (n = 12). Interference of various anions and cations were investigated with tolerance limit concentrations ranging from 10 -6 to 2.5 M depending on the type of ions. The developed method is simple and convenient, and it is a green method for iodine analysis, as it greatly reduces the amount of toxic reagent consumed with reagent volumes in the microfluidic scale.

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“…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.…”

mentioning

confidence: 99%

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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Use of pseudo-first order kinetics in flow injection for determination of trace inorganic iodine

Cited by 20 publications

References 12 publications

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

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

Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

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

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