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Detection of As(III) via oxidation to As(V) using platinum nanoparticle modified glassy carbon electrodes: arsenic detection without interference from copper.
Analyst. 2006 Apr; 131(4):516-21.A

Abstract

The electrochemical detection of As(III) was investigated on a platinum nanoparticle modified glassy carbon electrode in 1 M aqueous HClO4. Platinum nanoparticle modified glassy carbon electrodes were prepared by potential cycling in 0.1 M aqueous KCl containing 1 mM K2PtCl6. In each potential cycle, the potential was held at + 0.5 V for 0.01 s and at -0.7 V for 10 s. 25 cycles were optimally used to prepare the electrodes. The resulting electrode surfaces were characterized with AFM. The response to arsenic(III) on the modified electrode was examined using cyclic voltammetry and linear sweep voltammetry. By using the As(III) oxidation peak for the analytical determination, there is no interference from Cu(II) if present in contrast to the other metal surfaces (especially gold) typically used for the detection of arsenic; Cu(II) precludes the use of the As(0) to As(III) peak for quantitative anodic stripping voltammetry measurements due to the formation of Cu3As2 and an overlapping interference peak from the stripping of Cu(0). After optimization, a LOD of 2.1 +/- 0.05 ppb was obtained using the direct oxidation of As(III) to As(V), while the World Health Organization's guideline value of arsenic for drinking water is 10 ppb, suggesting the method may have practical utility.

Authors+Show Affiliations

Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UKOX1 3QZ.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16568168

Citation

Dai, Xuan, and Richard G. Compton. "Detection of As(III) Via Oxidation to As(V) Using Platinum Nanoparticle Modified Glassy Carbon Electrodes: Arsenic Detection Without Interference From Copper." The Analyst, vol. 131, no. 4, 2006, pp. 516-21.
Dai X, Compton RG. Detection of As(III) via oxidation to As(V) using platinum nanoparticle modified glassy carbon electrodes: arsenic detection without interference from copper. Analyst. 2006;131(4):516-21.
Dai, X., & Compton, R. G. (2006). Detection of As(III) via oxidation to As(V) using platinum nanoparticle modified glassy carbon electrodes: arsenic detection without interference from copper. The Analyst, 131(4), 516-21.
Dai X, Compton RG. Detection of As(III) Via Oxidation to As(V) Using Platinum Nanoparticle Modified Glassy Carbon Electrodes: Arsenic Detection Without Interference From Copper. Analyst. 2006;131(4):516-21. PubMed PMID: 16568168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Detection of As(III) via oxidation to As(V) using platinum nanoparticle modified glassy carbon electrodes: arsenic detection without interference from copper. AU - Dai,Xuan, AU - Compton,Richard G, Y1 - 2006/02/28/ PY - 2006/3/29/pubmed PY - 2006/3/29/medline PY - 2006/3/29/entrez SP - 516 EP - 21 JF - The Analyst JO - Analyst VL - 131 IS - 4 N2 - The electrochemical detection of As(III) was investigated on a platinum nanoparticle modified glassy carbon electrode in 1 M aqueous HClO4. Platinum nanoparticle modified glassy carbon electrodes were prepared by potential cycling in 0.1 M aqueous KCl containing 1 mM K2PtCl6. In each potential cycle, the potential was held at + 0.5 V for 0.01 s and at -0.7 V for 10 s. 25 cycles were optimally used to prepare the electrodes. The resulting electrode surfaces were characterized with AFM. The response to arsenic(III) on the modified electrode was examined using cyclic voltammetry and linear sweep voltammetry. By using the As(III) oxidation peak for the analytical determination, there is no interference from Cu(II) if present in contrast to the other metal surfaces (especially gold) typically used for the detection of arsenic; Cu(II) precludes the use of the As(0) to As(III) peak for quantitative anodic stripping voltammetry measurements due to the formation of Cu3As2 and an overlapping interference peak from the stripping of Cu(0). After optimization, a LOD of 2.1 +/- 0.05 ppb was obtained using the direct oxidation of As(III) to As(V), while the World Health Organization's guideline value of arsenic for drinking water is 10 ppb, suggesting the method may have practical utility. SN - 0003-2654 UR - https://www.unboundmedicine.com/medline/citation/16568168/Detection_of_As_III__via_oxidation_to_As_V__using_platinum_nanoparticle_modified_glassy_carbon_electrodes:_arsenic_detection_without_interference_from_copper_ L2 - https://doi.org/10.1039/b513686e DB - PRIME DP - Unbound Medicine ER -
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