Studies on Flame Photometry by Organic Solvent Extraction Method. III : Determination of Manganese and Copper by Oxine-Organic Solvent Extraction Method

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In connection with the micro-determination of metals by flame photometric studies are being made of the use of extraction with organic solvents in order to separate and remove interfering elements and to raise the sensitivity. In the present series of work, micro-determination of copper and manganese was carried out by extraction of oxine complex salts with organic solvent. The oxine complex salts of copper and manganese were extracted with methyl isobutyl ketone or other organic solvents, and the extract solution was directly sprayed and excited with an oxyhydrogen flame. The emission intensity of spectral lines was measured at 324.8 mμ for copper and at 403.5 mμ for manganese. In this case, sensitivity was increased by 6〜8 folds for copper and by 20〜30 folds for manganese compared with the intensities in aqueous solution. Interference of co-existing elements was practically eliminated by controlling the pH of the aqueous layer for the extraction. Conditions for flame photometry of the extract solution differed with different solvents, and these points were also examined.
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