鋼中の微量カルシウムの発光分光分析法

概要

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A solution method using a rotating graphite electrode and a direct emission spectrographic method has been studied to determine trace of calcium in steel. The experiment was performed with a 3.4 m Ebert type plane grating spectrograph. In the case of the solution method, after dissolution, of a steel sample by dilute sulfuric acid, its solution is directly excited by high voltage spark discharge without separation of iron. The counter electrode is a graphite rod and the iron spectral line can be used as the internal standard. Lower detection limit of this method is 5 ppm and the coefficient of variation is 2.5∿7.9% in the range of 14∿172ppm Ca. In the case of the direct emission spectrographic method, a steel rod sample is excited in the argon atmosphere by the low voltage spark discharge using a copper rod as a counter electrode with plus polarity. Lower detection limit of this method is 5 ppm and the coefficient of variation is 2.5∿11.7% in the range of 12∿125ppm Ca.
1970-08-01