Abstract

Procedures are described for the determination of iron impurities in titanium dioxide. Spectrophotometry, using bathophenanthroline or 1,10-phenanthroline, allows the determination of approximately 1, resp. 2 ppm of iron. Cathode-ray polarography permits the determination of as little as 2 ppm of iron using a direct procedure and 0.1 ppm after separation of the trace element from the matrix. The precision of the four methods described was tested on samples with known iron content. Various titanium dioxide products commercially available were analysed with satisfactory sensitivity and precision.

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