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Preconcentration of transition metal ions from ethanol solution onN-acyl-N′-benzoylthiourea — Modified silica gel

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Abstract

Silica gel was chemically modified with anN-acyl-N′-benzoylthiourea group. This material behaved as a selective means of preconcentrating Cu(II), Zn(II) and Cd(II) from ethanol by the column technique. Ethanolic solutions having 6 μmol of the metal ions were percolated through the column and retentions of 100% were achieved for all metals. Zinc and copper were eluted quantitatively from the column bed with 5mL of ethanolic O.1molL−1 (for Zn) and 0.9 mol L−1 (for Cu) citric acid. Cadmium was recovered totally with 60 mL of ethanolic 2.0 mol L−1 citric acid. The modified silica was shown to be chemically stable after various adsorption-elution cycles (at least twenty).

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Authors and Affiliations

  1. Departamento de Química, Universidade Estadual de Maringá, Av. Colombo, 5790-87020-900, Maringá-PR, Brazil

    Celso Pesco, Elvio Antonio de Campos & Creusa Maieru Macedo Costa

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  1. Celso Pesco
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  2. Elvio Antonio de Campos
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  3. Creusa Maieru Macedo Costa
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Pesco, C., Antonio de Campos, E. & Costa, C.M.M. Preconcentration of transition metal ions from ethanol solution onN-acyl-N′-benzoylthiourea — Modified silica gel. Mikrochim Acta 127, 229–232 (1997). https://doi.org/10.1007/BF01242727

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  • DOI: https://doi.org/10.1007/BF01242727

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