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A highly selective, sensitive and economical differential pulse polarographic method has been developed for the determination of trace amount of indium in various samples after adsorption of its 1-(2-pyridylazo)-2-naphthol on naphthalene in the pH range of 6.5-11.5. After filtration, the solid mass is shaken with 8 ml of 1 M hydrochloric acid and indium is determined by differential pulse polarography...
Iridium is preconcentrated from the large volume of its aqueous solution using 1-(2-pyridylazo-2-naphthol) (PAN) on microcrystalline naphthalene in the pH range of 4.5-6.0. The solid mass after filtration is dissolved with 5 ml of dimethylformamide (DMF) and the metal determined by first derivative spectrophotometry. The detection limit is 20 ppb (signal to noise ratio = 2) and the calibration curve...
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