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Anodic stripping voltammetric determination of silver ion at a carbon paste electrode modified with carbon nanotubes

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Abstract

A carbon paste electrode (CPE) was modified with multi-wall carbon nanotubes and successfully applied to the determination of silver ion by differential pulse anodic stripping voltammetry. Compared to a conventional CPE, a remarkably improved peak current response and sensitivity is observed. The analytical procedure consisted of an open circuit accumulation step for 2 min in −0.4 V, this followed by an anodic potential scan between +0.2 and + 0.6 V to obtain the voltammetric peak. The oxidation peak current is proportional to the concentration of silver ion in the range from 1.0 × 10−8 to 1.0 × 10−5 mol L−1, with a detection limit of 1.8 × 10−9 mol L−1 after an accumulation time of 120 s. The relative standard deviation for 7 successive determinations of Ag(I) at 0.1 μM concentration is 1.99%. The procedure was validated by determining Ag(I) in natural waters.

Differential pulse voltammogram (DPV) of Ag+ solution at MCPE

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Acknowledgement

We gratefully acknowledge the support of this work by the Persian Gulf University Research Council.

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Authors and Affiliations

  1. Department of Chemistry, Collage of Science, Shiraz University, Shiraz, 71454, IR, Iran

    Javad Tashkhourian

  2. Chemistry Department, Faculty of Science, Persian Gulf University, 75169, Boushehr, Iran

    Sana Javadi & Fatemeh Nami Ana

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  1. Javad Tashkhourian
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  2. Sana Javadi
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  3. Fatemeh Nami Ana
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Correspondence to Javad Tashkhourian.

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Tashkhourian, J., Javadi, S. & Ana, F.N. Anodic stripping voltammetric determination of silver ion at a carbon paste electrode modified with carbon nanotubes. Microchim Acta 173, 79–84 (2011). https://doi.org/10.1007/s00604-010-0528-5

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  • DOI: https://doi.org/10.1007/s00604-010-0528-5

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