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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 mu M range and an estimated limit of detection of ca. 10 mu M (or 2.3 ppm) for benzophenone-3 and ca. 20 mu M (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 approximate to 6000 mol(-1) dm(3) 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 mu M. The estimated limit of detection is improved to ca.5 mu M (or 1.2 ppm) for benzophenone-3 and ca. 10 mu M (or 2.3 ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.
Original language | English |
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Pages (from-to) | 28-35 |
Number of pages | 8 |
Journal | Analytica Chimica Acta |
Volume | 616 |
Issue number | 1 |
DOIs | |
Publication status | Published - 26 May 2008 |
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Dive into the research topics of 'Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan'. Together they form a unique fingerprint.Projects
- 1 Finished
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SAXSESS - SMALL ANGLE X-RAY SCATTERING SYSTEM FOR MATERIALS CHEMISTRY
Edler, K. (PI), Jones, '. (CoI), Marken, F. (CoI), Price, G. (CoI), Roser, S. (CoI) & Weller, A. (CoI)
Engineering and Physical Sciences Research Council
31/01/07 → 30/01/09
Project: Research council