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

Puacz, Wojciech

doi:10.1007/bf01364296

Cited by 2 publications

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“…For quantitative estimation of nitrogen the peak height as well as the peak area techniques were used [3]. 4. Direct injection enthalpimetry -the sulphur divalent compounds to be determined are injected into the iodine-azide solution in organic solvent.…”

Section: Methodsmentioning

confidence: 99%

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Application of the iodine-azide reaction to the catalytic determination of divalent sulphur compounds in alcoholic medium: Determination of ethylenethiourea in some biological materials

1996

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Abstract.A new catalytic method for the determination of divalent sulphur compounds, which are soluble or insoluble in water, based on the iodine-azide reaction in various alcoholic solutions is described. As model divalent sulphur catalysts the sodium sulphide and thiourea were chosen. Determination of ethylenethiourea in alcoholic extracts from apples and bananas was an example of practical application of the proposed method. To that purpose five previous elaborated techniques were adopted: titration, volumetric, gas chromatographic, enthalpimetric and potentiometric. The effect of other organic solvents, salts, acids and pH on the determination of divalent sulphur catalysts was also evaluated.Key words: catalysis, tritration, volumetry, enthalpimetry, potentiometry, gas chromatography, divalent sulphur compounds, ethylenethiourea.More than 600 methods of the determination of divalent sulphur compounds based on the catalyzed iodine-azide (i a) reaction in aqueous solution have been develop-S 2 ed and described in literature: 2NaN 3 + 12 ~ 2NaI + 3N 2. The extent of the i-a reaction and, in consequence, the sensitivity of the determination is different for each group of sulphur catalysts in the (-II) oxidation state. Our interest in determining sulphur compounds in mixed medium i~e. aqueous-organic, or non-aqueous medium, i.e. organic solvent or mixture of Organic solvents is connected with the fact that there are many divalent sulphur compounds (ca. 30%) which are insoluble or sparingly soluble in water or those which are decomposed in the first contact with water. Thereby they cannot be determined in aqueous solution. Replacement of

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Section: Methodsmentioning

confidence: 99%

“…The catalytic reaction takes place immediately after injection of the samples and terminates within 2 rain. The rise of the temperature is monitored with a thermistor in a Wheatstone bridge circuit and tt~e curve resistance change vs. time was the basis for the calculation of concentration of investigated s, ulphur catalysts [4,5]. 5.…”

Section: Methodsmentioning

confidence: 99%