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Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants : extraction and electrochemical determination of benzophenone-3 and triclosan
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Vidal, L., Chisvert, Alberto, Canals, Antonio, Psillakis, Elefteria, Lapkin, Alexei, Acosta, F., Edler, Karen J., Holdaway, James A. and Marken, Frank (2008) Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants : extraction and electrochemical determination of benzophenone-3 and triclosan. Analytica Chimica Acta, Vol.616 (No.1). pp. 28-35. doi:10.1016/j.aca.2008.04.011 ISSN 0003-2670.
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Official URL: http://dx.doi.org/10.1016/j.aca.2008.04.011
Abstract
Chemically surface-modified (tosyl-functionalized) carbon nanoparticles (Emperor 2000 from Cabot Corp.) are employed for the extraction and electrochemical determination of phenolic impurities such as benzophenone-3 (2-hydroxy-4-methoxybenzophenone) or triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol). The hydrophilic carbon nanoparticles are readily suspended and separated by centrifugation prior to deposition onto suitable electrode surfaces and voltammetric analysis. Voltammetric peaks provide concentration information over a 10–100 μM range and an estimated limit of detection of ca. 10 μM (or 2.3 ppm) for benzophenone-3 and ca. 20 μM (or 5.8 ppm) for triclosan. Alternatively, analyte-free carbon nanoparticles immobilized at a graphite or glassy carbon electrode surface and directly immersed in analyte solution bind benzophenone-3 and triclosan (both with an estimated Langmuirian binding constants of K ≈ 6000 mol−1 dm3 at pH 9.5) and they also give characteristic voltammetric responses (anodic for triclosan and cathodic for benzophenone-3) with a linear range of ca. 1–120 μM. The estimated limit of detection is improved to ca.5 μM (or 1.2 ppm) for benzophenone-3 and ca. 10 μM (or 2.3 ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Nanoparticles, Carbon, Voltammetry, Fungicides, Extraction (Chemistry), Electrochemical analysis | ||||
Journal or Publication Title: | Analytica Chimica Acta | ||||
Publisher: | Elsevier Science BV | ||||
ISSN: | 0003-2670 | ||||
Official Date: | May 2008 | ||||
Dates: |
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Volume: | Vol.616 | ||||
Number: | No.1 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 28-35 | ||||
DOI: | 10.1016/j.aca.2008.04.011 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | European Cooperation in the Field of Scientific and Technical Research (Organization) (COST) | ||||
Grant number: | Working Group D32/005/04 |
Data sourced from Thomson Reuters' Web of Knowledge
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