Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1069, Issue 2, Pages 173-181Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2005.02.029
Keywords
imprinted polymers; precipitation polymerisation; isotherms; binding sites; phenylurea herbicides; solid-phase extraction
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Three different molecularly imprinted polymers (MIPs) have been prepared by precipitation polymerisation using linuron (LIN) or isoproturon (IPN) (phenylurea herbicides) as templates and methacrylic acid (MAA) or trifluormethacrylic acid (TFMAA) as functional monomers. The ability of the different polymers to selectively rebind not only the template but also other phenylurea herbicides has been evaluated. In parallel, the influence of the different templates and functional monomers used during polymers synthesis on the performance of the obtained MIPs was also studied through different rebinding experiments. The experimental binding isotherms were fitted to the Langmuir-Freundlich isotherm allowing to describe the kind of binding sites present in the imprinted polymers under study. It was concluded that TFMAA-based polymer using IPN as templace presents the best properties to be used as a selective sorbent for the extraction of phenylurea herbicides. (c) 2005 Elsevier B.v. All rights reserved.
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