Determination of iodine in foods by cathodic stripping voltammetry

Holak, Walter

doi:10.1021/ac00144a047

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…The only interference that we have noted in marine samples analyzed to date is hydrogen sulfide. Sulfide has been noted as such by other workers (11,12). However, on acidification with aliquots of 1 N hydrochloric acid and purging, it is possible to remove the sulfide and determine the iodide content of the sample.…”

mentioning

confidence: 92%

“…is well-known that acidification of solutions containing iodate can lead to some conversion of iodate to iodide. Thus, our work differs from that of Propst (11) and Holak (12) because they were interested in measuring total iodine as iodide. Method Optimization.…”

mentioning

confidence: 97%

“…Propst (11) and Holak (12) have determined total iodine by converting all forms of iodine to iodide under acidic and reducing conditions and then determining iodide by cathodic stripping using normal pulse and differential pulse polarography, respectively. Although these methods Eire reliable for total iodine, they have not been explored for use in marine systems at seawater pH (near 8).…”

mentioning

confidence: 99%

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Direct determination of iodide in seawater by cathodic stripping square wave voltammetry

Luther¹,

Swartz²,

Ullman³

1988

Anal. Chem.

185

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confidence: 92%

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confidence: 97%

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confidence: 99%

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Direct determination of iodide in seawater by cathodic stripping square wave voltammetry

Luther¹,

Swartz²,

Ullman³

1988

Anal. Chem.

185

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“…In past studies, iodine has been separated from interfering chemical species by oxidizing iodide to iodine in solution and then purging the iodine out of solution into a trap (12)(13)(14). This method can be applied to halogen separation because halide=halogen redox pairs have distinctly different standard reduction potentials across the group and allow selective oxidation of iodine (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

Optimizing Separation of Iodine from Halogen Interferences in Preparation for TIMS Analysis

Metz¹,

Payne²,

Engelmann³

2011

Separation Science and Technology

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Low-level analysis of radioiodine performed by TIMS requires an initial chemical separation from interfering higher electronaffinity halogens. Experiments using 125 I and 36 Cl tracers have shown that iodide can be selectively oxidized and purged from solution while the chloride remains in the solution. A systematic investigation of the experimental factors that affect the oxidation and transfer of iodine along with the separation of iodide from chloride has been completed. Experimental design was used to determine the optimum experimental conditions by obtaining a better understanding of factor affects and interactions. Factors such as gas purge rate, experiment run time, and oxidant concentration were simultaneously studied in a central composite design of experiments and response surfaces were generated from results. Optimizing experimental factors resulted in improved iodide oxidation and transfer efficiencies, halogen separation, and shorter analysis times.

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“…Some of them utilize the formation of an insoluble products at the working electrode (e.g. Hg2I2 at a mercury electrode, 7 or AgI at a silver electrode), 8 the formation of an uncharged adsorbed species at a platinum surface, 9 or an ion-pairing with zephiramine at a glassy carbon electrode. 10 Anodic [11][12][13][14] or cathodic 15 stripping voltammetry has been applied after the preconcentration of iodide or iodine onto carbon-paste electrodes or chemically modified carbon-paste electrodes (CPEs).…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Method Based on an Ion-Pairing Reaction for the Determination of Trace Amount of Iodide at Carbon-Paste Electrodes

Fei

2003

ANAL. SCI.

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Experimental Reagents and samplesStock solutions of iodide (0.1 mol L -1 ) were prepared from potassium iodide (analytical grade) by adding doubly distilled Carbon-paste electrodes (CPEs) were studied to elucidate the cathodic stripping voltammetric determination of iodine. At an accumulation potential of 1.0 V (vs. SCE), iodide was preconcentrated on CPEs via an ion-pairing reaction, followed by oxidation to iodine. Then a linear scan voltammogram was recorded after 10 s of quiescent time by a cathodic potential scan from 0.7 V to 0.1 V at a scan rate of 100 mV s -1. A cathodic peak current was obtained at about 0.38 V.Various experiment parameters such as the acidity, chloride concentration, accumulation potential, accumulation time, concentration of cetyltrimethylammonium bromide (CTAB) and scan rate, were optimized to analyze the iodide by employing linear-scan stripping voltammetry. Under the optimal conditions, calibration curves were obtained over a wide concentration range of the iodide ion from 8 × 10 -9 mol L -1 to 5 × 10 -6 mol L -1 with a detection limit of 2 × 10 -9 mol L -1 at an accumulation time of 3 min. The effect of interfering species was evaluated and the procedure was applied to an iodide analysis in table salt, with good results.

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Determination of iodine in foods by cathodic stripping voltammetry

Cited by 19 publications

References 16 publications

Direct determination of iodide in seawater by cathodic stripping square wave voltammetry

Direct determination of iodide in seawater by cathodic stripping square wave voltammetry

Optimizing Separation of Iodine from Halogen Interferences in Preparation for TIMS Analysis

Voltammetric Method Based on an Ion-Pairing Reaction for the Determination of Trace Amount of Iodide at Carbon-Paste Electrodes

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