Abstract
In acidic solution, the group 4A elements form ternary heteropoly complexes with molybdophosphate, e.g., molybdotitanophosphate, molybdozirconophoaphate, and molybdohafnophosphate. Each ternary heteropoly molybdate gives a different chemical shift in its /sup 31/P NMR spectra, respectively, and its relative peak area increases with increasing metal ion concentration. Simultaneous determination of these elements was found to be possible within accuracies of 1 to 5% and detection limits for Tl, Zr, and Hf were 20, 40, and 60 ppm, respectively, under the proposed experimental condition. The small amounts of these ternary heteropoly molybdates in aqueous solution are extracted quantitatively with cyclohexanone. The optimum acidity for extraction was found to be in the pH range between 1.5 and 2.5 and its recovery in cyclohexanone was more than 95%. 14 references, 3 tables, 4 figures.
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