Reusable platinum nanoparticle modified boron doped diamond microelectrodes for oxidative determination of arsenite

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DOIResolve DOI: http://doi.org/10.1021/ac061528a
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TypeArticle
Journal titleAnalytical Chemistry
Volume79
Issue2
Pages500507; # of pages: 8
AbstractBoron doped diamond (BDD) macro- and microelectrodes were modified by electrodeposition of platinum nanoparticles using a multipotential step electrodeposition technique and used for the oxidative determination of arsenite, As(III). The formation of Pt nanoparticles was evident from cyclic voltammetry measurement, whereas AFM and SEM revealed the size and size distribution of deposited Pt nanoparticles. Raman spectroscopy illustrated a correlation between the typical BDD signature and the number of platinum deposition cycles. Linear sweep voltammetry performed with the modified BDD microelectrode outperformed its macrocounterpart and resulted in very low detecting currents with enhanced signal-to-noise ratios. With linearity up to 100 ppb and a detection limit of 0.5 ppb, the electrochemical system was applicable for processing tap and river water samples. Over 150 repetitive runs could be performed, and electrochemical etching of platinum allowed the reuse of the BDD microelectrode. The presence of copper and chloride ions, the two most severe interferents at levels commonly found in groundwater, did not interfere with the assay.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
NRC number49017
NPARC number3539395
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Record identifier0786f9d2-bdbf-4bb8-8a11-0f973386155f
Record created2012-03-06
Record modified2016-05-09
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