Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 1, Pages 85-89Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.11.005
Keywords
solid-phase extraction; square-wave voltammetry; multiwalled carbon nanotubes; organophosphate compounds; methyl parathion
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Multiwalled carbon nanotube (MWCNT) was developed as a new sorbent for solid-phase extraction (SPE) of organophosphate (OP) pesticides. A combination of SPE with square-wave voltammetric (SWV) analysis resulted in a fast, sensitive, and selective electrochemical method for determination of OP pesticide using methyl parathion (MP) as a representative. Because of the strong affinity of MWCNT for phosphoric group, nitroaromatic OP compounds can strongly bind to the MWCNT surface. The macroporosity and heterogeneity of MWCNT allow extracting a large amount of MP less than 5 min. The stripping response was highly linear over the MP range of 0.05-2.0 mu g/mL, with a detection limit of 0.005 mu g/mL. The determination of MP in garlic samples showed acceptable accuracy. The fast extraction ability of MWCNT makes it promising sorbent for various solid-phase extractions. (C) 2007 Elsevier B.V. All rights reserved.
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