Abstract

A spectrographic method for the determination of the strategic and critical elements tantalum and columbium, covering the concentration ranges 0.01 to 0.40 percent and 0.30 and 1.25 percent, respectively, is described. Samples are excited by an ac arc discharge using the point-to-plane technique. A prism-type spectrograph is employed, and the resulting spectrograms are recorded on calibrated emulsions. Utilizing the iron matrix as an internal standard, photographic photometry readings and intensity ratio comparisons are made for the analytical line pairs 3311.16 Ta vs 3165.86 Fe and 3299.61 Cb vs 3165.01 Fe. Included in the discussion are referee analyses, comparisons, working curves, and standards. The analytical results of this method indicate adequate sensitivity, precision, accuracy, and range of analysis for this type of material.

© 1952 Optical Society of America

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