Ionen-Chromatographie von Polyphosphaten und Phosphonaten

• DOI: 10.1007/bf00488208
• Publication Date: 2004-11-16T06:35:27Z
• Authors: E. Vaeth; P. Sladek; K. Kenar
• Keywords: 02 engineering and technology; 0210 nano-technology

A phosphorus-specific detection system was developed for ion-chromatographic determinations of polyphosphates and phosphonates. After hydrolysing the phosphates or oxidative decomposition of the phosphonates, the resulting o-phosphate is converted to the yellow phosphorusvanadomolybdenum acid and is measured photometrically at 410 nm. Even complex matrices (e.g., washing powder) give very simple chromatograms by phosphorus-specific detection. Moreover, it enables the use of many different eluting agents. With a KCl/EDTA-eluens the resolving power is very high and the column life is considerably prolonged as compared to the commonly used HNO3-eluens. Various examples of the separations of polyphosphates and phosphonates are shown and the retention times of some phosphonates are compiled.