Abstract

A spectrographic method for the analysis of zirconium-hafnium mixtures covering the hafnium/zirconium concentration ratio range from 0.001 to 100 is described. The samples are excited as conducting pellets prepared from mixtures of the combined oxides with powdered flake graphite. An overdamped condenser discharge is used for excitation. By utilizing a series of internal standard line pairs, the complete concentration range can be covered by a single exposure. At the same time, photographic photometry errors can be reduced by restricting the intensity ratio range over which these line pairs are measured. The unique similarity in the physical and chemical properties of zirconium and hafnium, combined with the use of line pairs of similar excitation characteristics, provides a system in which ideal internal standard conditions can be achieved. Experimental results indicate that, within the wide limits investigated, variations in excitation conditions, extraneous elements, graphite-oxide ratio in the pellets, crystal structure of the oxides, and chemical form of the samples, have no apparent effect on the analytical results. Precision determinations showed a standard deviation of about 1.5 to 2.0 percent.

© 1950 Optical Society of America

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