Molecularly imprinted solid-phase extraction sorbent for the clean-up of chlorinated phenoxyacids from aqueous samples.
A molecularly imprinted polymer (MIP) was synthesized using the herbicide 2,4,5-trichlorophenoxyacetic acid as a template, 4-vinylpyridine as an interacting monomer, ethylendimethacrylate as a cross-linker and a methanol-water mixture as a porogen. The binding properties and the selectivity of the polymer towards the template were investigated by frontal and zonal liquid chromatography. The polymer was used as a solid-phase extraction material for the clean-up of the template molecule and some related herbicides (2,4-dichlorophenoxyacetic acid, fenoprop, dichlorprop) from river water samples at a concentration level of ng/ml with quantitative recoveries comparable with those obtained with a traditional C18 reversed-phase column when analyzed by capillary electrophoresis. The results obtained show that the MIP-based approach to the solid-phase extraction is comparable with the more traditional solid-phase extraction with C18 reversed-phase columns in terms of recovery, but it is superior in terms of sample clean-up.
Baggiani
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Dipartimento di Chimica Analitica. Università di Torino, Turin, Italy. baggiani@ch.unito.it
Giovannoli
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C
Anfossi
L
L
Tozzi
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C
D015085:2,4,5-Trichlorophenoxyacetic Acid / Q000032:analysis*; D019075:Electrophoresis, Capillary / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D011108:Polymers; D015203:Reproducibility of Results; D014867:Water / Q000737:chemistry
D006540:Herbicides; D011108:Polymers; D014867:Water; D015085:2,4,5-Trichlorophenoxyacetic Acid