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Chemically surface modified carbonnanoparticle carrier for phenolic pollutants:Extraction and electrochemical determinationof benzophenone-3 and triclosan

Elefteria Psillakis, Lorena Vida, Alberto Chisver, Antonio Canals

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Year 2008
Type of Item Peer-Reviewed Journal Publication
Bibliographic Citation L.Vidal, A.Chisvert, A. Canals, .E Psillakis, A.Lapkin, F. Acosta, K. J Edler, J. A Holdaway, F.Marken , "Chemically surface modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan ",Anal. Chimi. Acta ,vol.616, no.1 ,pp.28–35,2008.doi:10.1016/j.aca.2008.04.011
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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􏰀M range and an estimated limit of detection of ca. 10􏰀M (or 2.3 ppm) for benzophenone-3 and ca. 20 􏰀M (or 5.8 ppm) for triclosan.Alternatively, analyte-free carbon nanoparticles immobilized at a graphite or glassy car- bon 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 􏰀M. The estimated limit of detection is improved to ca.5 􏰀M (or 1.2 ppm) for benzophenone-3 and ca. 10 􏰀M (or 2.3 ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.

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