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  • Title: Differential pulse polarography determination of indium after column preconcentration with [1-(2-pyridylazo)-2-naphthol]-naphthalene adsorbent or its complex on microcrystalline naphthalene.
    Author: Taher MA.
    Journal: Talanta; 2000 Jun 21; 52(2):301-9. PubMed ID: 18967989.
    Abstract:
    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 (DDP). Indium can alternatively be quantitatively adsorbed on [1-(2-pyridylazo)-2-naphthol]-naphthalene adsorbent packed in a column and determined similarly. The detection limit is 0.2 ppm (signal to noise ratio=2) and the linearity is maintained in the concentration range 0.8-125 ppm with a correlation coefficient of 0.9994 and relative standard deviation of +/-0.96%. Characterization of the electroactive process included an examination of the degree of reversibility. Various parameters such as the effect of pH, volume of aqueous phase and interference of a number of metal ions on the determination of indium have been studied in detail to optimize the conditions for determination in various samples.
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