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Microdetermination of phosphorus in organic compounds by indirect spectrophotometric reactions

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Summary

Organo phosphorus compounds are decomposed by closed-flask combustion. The phosphate ions produced are then converted to phosphomolybdic acid and extracted withiso- butyl acetate. The 12molybdate ions associated with each original phosphate ion are spectrophotometrically determined by reactions with alkaline hydrogen peroxide, hydrogen peroxide and benzidine and gallic acid. The colours are measured at 450, 400 and 400nm respectively.

Zusammenfassung

Organische Phosphorverbindungen werden im Schöniger-Kolben mineralisiert. Das Phosphat wird zu Phosphormolybdänsäure umgesetzt, miti-Butylacetat extrahiert und dann spektrophotometrisch bestimmt. Dazu bedient man sich der Reaktionen mit alkalischem Wasserstoffperoxid, mit Wasserstoffperoxid und Benzidin oder mit Gallussäure. Die Messungen erfolgen bei 450 nm im ersten Fall, bei 400 nm im Fall der beiden letztgenannten Farbreaktionen.

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Author notes

  1. W. I. Awad

    Present address: Department of Chemistry, Faculty of Science, Baghdad University, Baghdad, Iraq

Authors and Affiliations

  1. Research Microanalytical Laboratory, Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt

    W. I. Awad, S. S. M. Hassan & S. A. I. Thoria

Authors
  1. W. I. Awad
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  2. S. S. M. Hassan
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  3. S. A. I. Thoria
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Additional information

This paper is taken from the Master's Thesis of S. A. I. Thoria.

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Awad, W.I., Hassan, S.S.M. & Thoria, S.A.I. Microdetermination of phosphorus in organic compounds by indirect spectrophotometric reactions. Mikrochim Acta 66, 111–118 (1976). https://doi.org/10.1007/BF01257101

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  • DOI: https://doi.org/10.1007/BF01257101

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