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Zur Analytik von Polymethylenphosphonsäuren

III. Untersuchungen zur Stabilität von Ethylendiamintetramethylenphosphonsäure (EDTMP) in wäßriger Lösung [1]

On the analysis of polymethylenephosphonic acids

III. Stability of ethylenediaminetetramethylenephosphonic acid (EDTMP) in aqueous solution [1]

  • Original Papers
  • Analysis of Polymethylephosphonic Acids
  • Published:
Fresenius' Zeitschrift für analytische Chemie Aims and scope Submit manuscript

Summary

The hydrolytic stability of organophosphonic acids, comprising >NCH2PO3H2 moieties, is studied exemplarily on aqueous solutions of ethylenediaminetetramethylenephosphonic acid (EDTMP). Metabolization of EDTMP increases severely at lower pH values, and is enhanced at higher temperature. The formation of orthophosphate in the course of the hydrolytical degradation can be established unequivocally by several, methodologically independent analytical procedures. By ion chromatography, the presence of (inorganic) phosphonate (phosphite) is affirmed in alkaline, and of hydroxymethylphosphonate in neutral to acid solutions. Formation of all three metabolites is in accord with a general degradation mechanism proposed here. The results of these stability investigations have far-reaching consequences for the analytical practice, as well as for the industrial application of organophosphonic acids.

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Author notes

  1. Peter Fischer

    Present address: Institut für Anorganische und Analytische Chemie, TU Clausthal, Paul-Ernst-Strasse 4, D-3392, Clausthal-Zellerfeld, Bundesrepublik Deutschland

Authors and Affiliations

  1. Institut für Lebensmittelchemie und Analytische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-7000, Stuttgart 80, Bundesrepublik Deutschland

    Gabriele Tschäbunin & Georg Schwedt

  2. Institut für Organische Chemie, Biochemie und Isotopenforschung, Universität Stuttgart, Pfaffenwaldring 55, D-7000, Stuttgart 80, Bundesrepublik Deutschland

    Peter Fischer

Authors
  1. Gabriele Tschäbunin
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  2. Georg Schwedt
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  3. Peter Fischer
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Tschäbunin, G., Schwedt, G. & Fischer, P. Zur Analytik von Polymethylenphosphonsäuren. Z. Anal. Chem. 333, 123–128 (1989). https://doi.org/10.1007/BF00474021

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  • DOI: https://doi.org/10.1007/BF00474021

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