Fresenius' Zeitschrift für analytische Chemie

, Volume 311, Issue 1, pp 19–22 | Cite as

Determination of fluoride in plant material with a ione-selective electrode

  • Berit Eyde
Original Papers

Summary

A method is described for determination of totalfluoride in plant material using the Orion fluorideselective electrode. Dried and ground samples are fused in nickel crucibles with sodium hydroxide. To the melt is added water, dil. hydrochloric acid and citrate buffer solution. The filtered solution are then measured with the electrode. The investigation also includes a study of the influence of ionic strength, pH, and interfering ions as iron and aluminium. The effect of storage of dissolved samples in glass and polyethylen bottles has also been studied. With more than about 0.4 ppm of F standard deviation is about 4–5%. With 0.1 ppm it is 20%.

Keywords

Sodium Iron Aluminium Nickel Filtration 

Fluoridbestimmung in Pflanzenmaterial mit Hilfe der ionenselektiven Elektrode

Zusammenfassung

Zur Bestimmung wird die fluorid-selektive Orion-Elektrode verwendet. Die getrockneten und gemahlenen Proben werden im Nickeltiegel mit NaOH geschmolzen und durch Zugabe von Wasser, verd. HCl und Citratpuffer und anschließende Filtration die Meßlösung erhalten. Der Einfluß von Ionenstärke, pH, Fremdionen (Fe, Al), sowie der Lagerung in Glas und Polyethylenflaschen wurde untersucht. Bei mehr als 0,4 ppm F beträgt die Standardabweichung 4–5%, bei 0,1 ppm etwa 20%

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Berit Eyde
    • 1
  1. 1.Chemical Analytical LaboratoryAgricultural University of NorwayNorway

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