Abstract
Das empfindliche und relativ einfache Verfahren beruht auf der Extraktion des Tetraphenylphosphonium-Kations mit dem Vanadium(V)-4-(2-pyridylazo)-resorcin-Komplex und Absorptionsmessung der gefärbten organischen Phase bei 560 nm (molarer Extinktionskoeffizient 3,9 · 104 l · mol−1 · cm−1). Das Lambert-Beersche Gesetz wird im Bereich von 1 · 10−6 −5 · 10−5 M Tetraphenylphosphonium im Extrakt befolgt. Die relative Standardabweichung beträgt ±2% im Bereich von 10−5 M und 5–10% im Bereich von 10−6 M. Die Methode ist empfindlicher und weniger störanfällig als die direkte UV-Methode.
Summary
A sensitive and relatively simple method for determination of tetraphenylphosphonium salts is described. It is based on the extraction of tetraphenylphosphonium cation with vanadium(V)-4-(2-pyridylazo)-resorcinol complex, followed by the spectrophotometric measurements of coloured organic phase. Absorption maximum occurs at 560 nm with effective molar absorptivity 3.9×104 l mol−1 cm−1. Lambert-Beer's law is obeyed all over the range suitable for spectrophotometric measurements, corresponding to 1×10−6 −5×10−5 M tetraphenylphosphonium in extract. Relative standard deviation is about ±2% in the 10−5 M and about 5–10% in the 10−6 M concentration range. The method is more sensitive and less subject to spectral interferences than direct UV-method.
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Široki, M., Marić, L. Extraction-visible spectrophotometric method for the determination of tetraphenylphosphonium salts. Z. Anal. Chem. 276, 371–375 (1975). https://doi.org/10.1007/BF00429495
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DOI: https://doi.org/10.1007/BF00429495