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Issue 1, 2010
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Sol-Gel-Au nano-particle modified carbon paste electrode for potentiometric determination of sub ppb level of Al(iii)

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Abstract

This work describes a new carbon paste electrode modified by Sol-Gel-Au nano-particle (SGAN) in the presence of 2,2′-dihydroxy-1-naphthylidine-1′-naphthyl methyl amine (DNMA) as ionophore for determination of Al(III) by potentiometric method. Gold nano-particles (GNPs) were self-assembled onto silica Sol-Gel network and incorporated within carbon paste. The nano-structured matrix with DNMA shows well-defined potentiometric behavior for the determination of Al3+ in aqueous solutions. The sensor exhibits significantly enhanced selectivity toward Al3+ ions over a wide concentration range of 5.0 × 10−10 to 5.0 × 10−2 M with a lower detection limit of 2.0 × 10−10 M (0.054 ppb) and a Nernstian slope of 20.0 ± (0.1) mV decade−1 of Al3+ activity. It has a fast response time of 5 s and can be used for at least 70 days without any considerable divergence in potentials. The potentiometric response of the electrode is independent of pH of test solution in the pH range 3–7. The interaction between DNMA and Al3+ was studied spectrophotometrically and it exhibits that stoichiometry of complex is 1 : 1 in methanol solution. Finally, this electrode was successfully used as an indicator electrode for potentiometric determination of Al3+ in some real samples.

Graphical abstract: Sol-Gel-Au nano-particle modified carbon paste electrode for potentiometric determination of sub ppb level of Al(iii)

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Publication details

The article was received on 08 Jul 2009, accepted on 23 Oct 2009 and first published on 16 Nov 2009


Article type: Paper
DOI: 10.1039/B9AY00103D
Anal. Methods, 2010,2, 24-31

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    Sol-Gel-Au nano-particle modified carbon paste electrode for potentiometric determination of sub ppb level of Al(III)

    M. H. Mashhadizadeh and H. Khani, Anal. Methods, 2010, 2, 24
    DOI: 10.1039/B9AY00103D

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