Double indication in catalytic-kinetic analysis: simultaneous photometric and thermometric indication of the iodine-azide reaction in closed and flow systems

Weisz, Herbert; Meiners, Wolfgang; Fritz, Guenter

doi:10.1016/s0003-2670(01)93220-9

Cited by 23 publications

(4 citation statements)

References 4 publications

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“…This reaction, however, is very much accelerated in the presence of sulfide or thiol-containing compounds in the medium. 9,[16][17][18][19][20][21][22][23][24][25][26][27] This reaction can be followed spectrophotometrically by monitoring the change in the absorbance at 348 nm.…”

Section: Resultsmentioning

confidence: 99%

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Kinetic Spectrophotometric Determination of Sulbutiamine in Pharmaceutical Preparations and in Human Serum

Metwally

El-Shabrawy

2000

ANAL. SCI.

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A kinetic spectrophotometric method was developed for the determination of sulbutiamine based on the catalytic effect on the reaction between sodium azide and iodine in an aqueous solution. Sulbutiamine at concentrations of 0.5 to 20 µg/ml was determined by measuring the decrease in the absorbance of iodine at 348 nm by a fixed-time method. The decrease in the absorbance in the first 5 min from the initiation of the reaction is related to the concentration of the drug. The detection limit of the procedure was 0.2 µg/ml. The relative standard deviation for the replicate determination (n = 10) of 4 µg/ml was 1.05%. The proposed procedure was successfully utilized in the determination of the drug in pharmaceutical preparations and human serum.

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Section: Resultsmentioning

confidence: 99%

“…[18][19][20][21][22][23][24][25][26][27] The aim of the present study was to establish a catalytickinetic spectrophotometric procedure for the determination of sulbutiamine in pharmaceutical dosage forms and in human serum, based on its catalytic effect on an iodine-azide reaction.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Spectrophotometric Determination of Sulbutiamine in Pharmaceutical Preparations and in Human Serum

Metwally

El-Shabrawy

2000

ANAL. SCI.

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“…Weisz et al (15) have extended the application of simultaneous monitoring of catalyzed reactions with two independent indication systems. Accuracy and precision of the determination is said to be improved by this approach.…”

Section: Catalyzed Reaction Rate Methodsmentioning

confidence: 99%

Kinetic determinations and some kinetic aspects of analytical chemistry

Mottola¹,

Mark²

1980

Anal. Chem.

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“…There are many papers describing an advantage of the use of catalytic reaction in direct injection enthalpimetry (DIE) [1--3] and thermometric enthalpy titrations (TET) [4--6]. Weisz et al developed the method of analysis of many sulphur compounds using also the iodine-azide reaction and an optical and thermometric measurement in closed and flowing systems [9]. Weisz et al developed the method of analysis of many sulphur compounds using also the iodine-azide reaction and an optical and thermometric measurement in closed and flowing systems [9].…”

mentioning

confidence: 99%

Catalytic-enthalpimetric determination of sulphur(II) compounds in non-aqueous Media

Puacz¹

1986

Mikrochim Acta

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The direct injection enthalpimetry was applied to the determination of sulphides, thiourea, dithiocarbamates, dithizone and benzothiazole by means of catalytic iodine-azide reaction in non-aqueous media. The determined compounds are injected into the iodine-azide solution in dimethylformamide, dimethylsulphoxide, formamide and into the mixture of these solvents. The catalytic reaction takes place immediately on injection of the samples and terminates within 2 rain. The rise in temperature is monitored with a thermistor in a Wheatstone bridge circuit and the curve resistance change-time was the basis for the calculation of investigated concentration of sulphur catalysts.

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Double indication in catalytic-kinetic analysis: simultaneous photometric and thermometric indication of the iodine-azide reaction in closed and flow systems

Cited by 23 publications

References 4 publications

Kinetic Spectrophotometric Determination of Sulbutiamine in Pharmaceutical Preparations and in Human Serum

Kinetic Spectrophotometric Determination of Sulbutiamine in Pharmaceutical Preparations and in Human Serum

Kinetic determinations and some kinetic aspects of analytical chemistry

Catalytic-enthalpimetric determination of sulphur(II) compounds in non-aqueous Media

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