Kinetic determination of iodide, based on the chlorpromazine—bromate reaction

Viñas, Pilar

doi:10.1016/0039-9140(87)80045-0

Cited by 15 publications

(2 citation statements)

References 13 publications

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“…A kinetic method based on the catalytic effect of iodide on the chlorpromazine-bromate reaction was applied to the determination of iodide in rat thyroid and in iodinated salts [157]. The reaction was followed spectrophotometrically (525 nm) and under optimal conditions ( lo4 M chlorpromazine hydrochloride, 1.4 M phosphoric acid, 5 x lo4 M potassium bromate, 40 ") iodide was determined between 5 and 70 ng/mL by the tangent method.…”

Section: (V) Iodide In Miscellaneous Matricesmentioning

confidence: 99%

The determination of iodine species in environmental and biological samples (Technical Report)

Edmonds¹,

Morita²

1998

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is The determination of iodine species in environmental and biological samples (Technical Report)Abstract: Iodine is found in organic forms in plants and animals and in inorganic forms in natural water samples. Methods of identification and quantitative determination for iodine species are decided by the types of compound and the matrices in which they occur. Iodine is an essential element and specific radioimmunoassay methods have been devised for physiologically important compounds (thyroxine and related compounds) in which it is found. In addition, marine plants and animals have provided a rich source of varied and unexpected organic iodine compounds that occur, along with other organic halogen compounds, as secondary metabolites. Natural waters, particularly marine waters contain iodine chiefly in the forms of iodide and iodate. Organic iodine compounds in biological samples have been identified by classical natural products chemical techniques following their isolation, and by modem spectroscopic methods. Routine analysis of such compounds can be done by gas chromatography (GC) and high performance liquid chromatography (HPLC). Analysis of inorganic iodine species in waters is carried out by catalytic, electrochemical and spectrometric methods and by GC; possibly HPLC inductively coupled-mass spectrometry (ICP-MS) might be the method of choice in the future.

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Section: (V) Iodide In Miscellaneous Matricesmentioning

confidence: 99%

The determination of iodine species in environmental and biological samples (Technical Report)

Edmonds¹,

Morita²

1998

Pure and Applied Chemistry

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“…The reaction rate is measured by stopping a segment of the merged serum and antiserum zones in the flow cell after 14 s of sample injection and measuring the turbidity 30 and 60 s after stopping the zone. As many as 40 samples can be processed per hour. applied a reactor with immobilized glucose oxidase and unsegmented-continuous-flow processing to study the kinetics of D-glucose mutarotation.…”

Section: Miscellaneous Kinetic Aspects Of Analytical Interestmentioning

confidence: 99%

Kinetic determinations and some kinetic aspects of analytical chemistry

Mottola¹,

Pérez‐Bendito²,

Mark³

1988

Anal. Chem.

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Catalytic Kinetic Determinations: Nonenzymatic

Kawashima

Teshima

Nakano

2000

Encyclopedia of Analytical Chemistry

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Although a catalyst does not shift the position of equilibrium but it does markedly change the reaction rate, because the catalyst lowers the activation energy of a reaction providing an alternative favorable route for the formation of the products. The reacted catalyst is regenerated and is repeatedly involved in an indicator reaction. When the rate depends on the concentration of the catalyst, it can be determined by measuring the change in the physical properties of the reactants and/or products in the indicator reaction. The change in a physical property such as absorbance, fluorescence, chemiluminescence (CL) or electrode potential of a reaction system is usually monitored with time. This methodology is called catalytic methods or kinetic–catalytic methods of analysis. Kinetic–catalytic methods of analysis based on catalyzed reactions have progressed recently and have been applied to trace analyses for various catalysts (element) because of their extremely high sensitivity, low limit of detection and selectivity. Several reactions such as redox, ligand substitution and complexation reactions have been utilized as indicator reactions for the development of kinetic–catalytic methods of trace analyses. Most of the catalysts in redox reactions are metal ions or inorganic anions having different oxidation states such as cobalt, copper, chromium, iron, manganese, vanadium, selenium, iodide, bromide and nitrite. Oxidants capable of regenerating the catalyst are hydrogen peroxide, chlorate, bromate, periodate and dissolved oxygen. Reductants include ascorbic acid, hydroxylamine, hypophosphorous acid, alkali sulfides, dithiothreitol and tin(II). Certain substances significantly increase the rate of catalyzed reactions. These substances are referred to as activators and have been defined as substances that do not catalyze the indicator reaction but enhance the catalytic effect of the catalyst. Activators provide high sensitivity and selectivity in kinetic–catalytic methods. Such improved specificity can be expected to eliminate the preliminary separation in many instances. As the measurement includes time as an experimental variable, care is needed to ensure that mixing of reagents takes place at regular time intervals to obtain highly accurate results using a manual procedure. Such disadvantages in the manual system can be overcome by using flow‐injection analysis (FIA), in which the reaction time can easily be controlled by varying the flow rate of the solutions and the length of the reaction coil. Kinetic–catalytic methods allow the determination of various elements at nanogram and picogram levels (10 −11 M) with a simple and reasonable equipment. The detection limits (DLs) of the methods are of the order of picograms per milliliter with good accuracy and precision and are almost equal to those for inductively coupled plasma mass spectrometry (ICPMS). The application of catalytic effects of metal ions in titrimetry has been recognized for a long time. This methodology is called catalytic titration and involves two consecutive reactions, i.e. titration reaction and indicator reaction. The determinable concentration is almost 10 −6 M of the metal ions.

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Kinetic determination of iodide, based on the chlorpromazine—bromate reaction

Cited by 15 publications

References 13 publications

The determination of iodine species in environmental and biological samples (Technical Report)

The determination of iodine species in environmental and biological samples (Technical Report)

Kinetic determinations and some kinetic aspects of analytical chemistry

Catalytic Kinetic Determinations: Nonenzymatic

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