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Issue 9, 2009
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Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

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Abstract

A solid contact ion-selective electrode using for the first time multi-walled carbon nanotubes (MWCNT) for the transducer material was developed for detecting perchlorate in water. To demonstrate the excellent ion-to electron transducer ability of the MWCNTs, a 15 µm thick layer of carboxylated MWCNT was deposited between an acrylic membrane selective to perchlorate ions and a glassy carbon rod used as the substrate and electrical conductor. The electrodes showed a Nernstian response of 57 mV decade−1 (standard deviation of 3 mV decade−1 over time and different electrodes) across a wide linear range of 10−6 to 10−2 M. The limit of detection was 10−7.4 M of perchlorate. The response time was less than 10 s for activities higher than 10−6 M and the intermediate-term potential stability shows a small drift of 0.22 mV h−1 recorded over 5 hours. The electrode displays a selectivity comparable to liquid-contacted ISEs containing the same membrane.

Graphical abstract: Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

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Publication details

The article was received on 24 Apr 2009, accepted on 30 Jun 2009 and first published on 15 Jul 2009


Article type: Paper
DOI: 10.1039/B908224G
Citation: Analyst, 2009,134, 1905-1910
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    Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

    E. J. Parra, G. A. Crespo, J. Riu, A. Ruiz and F. X. Rius, Analyst, 2009, 134, 1905
    DOI: 10.1039/B908224G

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