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. ISSN 0003-2670

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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
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Science > 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
Date:	May 2008
Volume:	Vol.616
Number:	No.1
Number of Pages:	8
Page Range:	pp. 28-35
Identification Number:	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
URI:	http://wrap.warwick.ac.uk/id/eprint/37171

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