Studies in the separation and determination of zirconium using vanillin as an analytical reagent

Vanillin, quantitatively precipitates zirconium between pH 5·0–6·5, as insoluble complex. This complex on ignition gives ZrO₂ which can be weighed. Zirconium can be readily separated and determined in the presence of varying quantities of chromium (III), cobalt (II), copper (II), manganese (II), molybdenum (VI), nickel (II), titanium (IV), tungsten (VI), uranium (VI), vanadium (V), zinc (II) and trivalent rare earths.