Abstract

A spectrographic method is presented for the quantitative determination of hafnium in zirconium in the range 0.2%, to 5% HfO2 The sample in the form of a fine powder is burnt in a D.C. arc at 15 amp., 220 V, and the spectrum photographed with a large quartz spectrograph. he hafnia concentration is determined from the ratio of the intensities of the spectral lines HfII 2861.696 Å and ZrII 2856.065 Å. A standard deviation of ± 6% has been obtained by this method for samples essentially free from other impurities, especially Fe, Al, Mg and Na.

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