Extraction voltammetric determination of phosphorus |
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Authors: | I. Helms, A. Mö ller F. Scholz |
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Affiliation: | (1) Institut für Angewandte Analytik und Umweltchemie, Fachbereich Chemie, Humboldt-Universität, Hessische Strasse 1–2, D-10115 Berlin, Germany |
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Abstract: | The proposed method for the determination of phosphorus is based on the extraction of molybdophosphoric acid. A mixture of methyl-iso-butyl-ketone and cyclohexane is used as extractant. The addition of cyclohexane allows the separation from silicon. Sodium chlorate is used as oxidant and gives rise to a catalytic current. The voltammetric behaviour of molybdophosphoric acid is described, comparing the dropping mercury electrode and the glassy carbon electrode. The 3-detection limit is 2.3 · 10–8 mol P/l. The method was applied to water samples from the river Spree.Dedicated to Professor Dr. W. Fresenius on the occasion of his 80th birthday |
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