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

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 microm thick layer of carboxylated...

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Published inAnalyst (London) Vol. 134; no. 9; pp. 1905 - 1910
Main Authors PARRA, Enrique J, CRESPO, Gastón A, RIU, Jordi, RUIZ, Aurora, XAVIER RIUS, F
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2009
Subjects
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
Water
Stability
Carbon nanotubes
Selectivity
Perchlorates
Carbon
Ion selective electrode
Transducer
Response time
Detection limit
Membrane
Standard deviation
Electrical conductor
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Summary: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 microm 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.
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ISSN:0003-2654
1364-5528
1364-5528
DOI:10.1039/b908224g