Studies on Flame Photometry by Organic Solvent Extraction Method. II : Flame Photometric Determination of Calcium by Extraction with Methyl Isobutyl Ketone

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In the micro-determination of metals by flame photometry, the extraction with organic solvent was adopted in order to remove interfering elements and to increase the sensitivity. Following the preceding work on the micro-determination of magnesium by this method, experiments were carried out on the determination of calcium. The oxine complex salt of calcium was extracted with methyl isobutyl ketone, and various conditions for the flame photometric analysis of the extract solution were examined. Measurement was made at the wave length of 554 or 622 mμ under hydrogen pressure of 2.0 lb/in^2 and oxygen pressure of 25 lb/in^2. According to the examination of interfering elements, the presence of magnesium, barium, and sodium, which interfere with the analysis in aqueous solution, had no effect, and moreover the presence of phosphorus, which causes serious error in the determination of calcium, was permissible to a greater extent than in the case of aqueous solution. Application of this method to the analysis of calcium in iron and steel allows the determination of calcium above 0.001 per cent with a better sensitivity than in the case of aqueous solution.