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Abstract
Abstract A procedure is described for the spectrophotometric determination of metals after extraction with molten naphthalene. Some metal ions react in aqueous solution with complex-forming reagents such as oxine, 2-methyl-oxine, dimethylglyoxime or α-benzil dioxime to form water-insoluble complexes in certain pH ranges, the complexes being easily extracted into molten naphthalene. The extracted mixture of metal complex and naphthalene is dissolved in dimethylformamide and the amount of each metal is determined spectrophotometrically. The working range of metal ion concentration and effect of various factors such as pH, amount of reagent and naphthalene were studied, and the molar absorptivity, sensitivity and relative standard deviation evaluated.
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