Fresenius' Zeitschrift für analytische Chemie

, Volume 333, Issue 2, pp 117–122 | Cite as

Zur Analytik von Polymethylenphosphonsäuren

II. Post-column-Derivatisierung nach ionen-chromatographischer Trennung [1]
  • Gabriele Tschäbunin
  • Peter Fischer
  • Georg Schwedt
Original Papers Analysis of Polymethylenephosphonic Acids

On the analysis of polymethylenephosphonic acids

II. A systematic survey of post-column derivatization in ion chromatography [1]


For the ion-chromatographic separation of structurally diverse phosphonic acids on Dionex HPIC AS7, postcolumn derivatization with Fe(III) and subsequent UV detection is systematically investigated, and optimized postcolumn eluent (PCE) conditions are given. The complexes are detected with highest sensitivity close to the absorption maximum at 300 nm, contrary to the practice in the literature (330 nm). It is further tested whether and to which extent this derivatization and detection methodology may be transferred to post-column complexation with Cu(II) and Ni(II), and also to a specific UV detection of orthophosphate. Direct RI detection, without previous enrichment, is described and compared in its validity and applicability to post-column complexation/UV detection. A photometric method is presented which allows for differentiation between inorganic phosphate, compounds which can be hydrolyzed to, and compounds which can be oxidized to orthophosphate, and thus makes a rapid control possible of reaction mixtures or stock solutions for these different phosphor species.


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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Gabriele Tschäbunin
    • 1
  • Peter Fischer
    • 2
  • Georg Schwedt
    • 1
  1. 1.Institut für Lebensmittelchemie und Analytische ChemieUniversität StuttgartStuttgart 80Bundesrepublik Deutschland
  2. 2.Institut für Organische Chemie, Biochemie und IsotopenforschungUniversität StuttgartStuttgart 80Bundesrepublik Deutschland

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