Abstract
Procedures are described for the determination of zinc impurities in titanium dioxide. For large zinc contents (>0.1%) a titration method with hexacyanoferrate(II) was used, the end-point being determined potentiometrically. For lower contents (≥0.1 ppm) zinc was determined by cathode-ray polarography in a NH4OH/NH4Cl supporting electrolyte after separation from titanium(IV) by extraction as dithizonate at pH 8.3 from citrate solution. The accuracy of the two methods was tested on synthetic samples by adding known quantities of zinc to a titanium solution freed from this element. Various titanium dioxide products commercially available were analysed, with satisfactory sensitivity (reproducibility 0.2% resp. 5%).
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