Spectrographic Determination of Microamounts of Calcium and Magnesium in Cast Iron by Porous-Cup Technique

概要

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A spectrochemical method was studied to determine simultaneously microamounts of calcium and magnesium in cast iron. Samples were dissolved with acid, iron was removed by methyl isobutyl ketone extraction, then the solution containing calcium and magnesium was put in a porous-cup electrode and the spectra were excited with a condensed spark. Strontium and beryllium were added as the internal standard elements for calcium and magnesium, respectively, and SrII 4215.52A/CaII 3933.67A and BeII 3130.42A/MgII 2802.70A were used as the analytical line pairs. This method was applicable to the determination of calcium and magnesium in contents above 0.005 per cent, and the variation coefficients were 13.5 per cent for calcium and 9.7 per cent for magnesium at a concentration level of 0.01 per cent.
東北大学の論文