Journal
MICROCHIMICA ACTA
Volume 180, Issue 5-6, Pages 363-370Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-013-0942-6
Keywords
Magnetic molecularly imprinted polymer; Extraction; Capillary liquid chromatography; Sulfonylurea herbicides; Environmental water samples
Categories
Funding
- Spanish Ministry of Science and Innovation [CTQ2010-15027]
- INCRECYT research contract
- Junta de Comunidades de Castilla-La Mancha
- Fondo Social Europeo
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We have developed a simple method for the extraction of sulfonylurea herbicides (SUHs) from environmental water samples. It is based on a magnetic molecular imprint (MMIP) as a sorbent. The MMIP was prepared using metsulfuron-methyl as the template molecule, methacrylic acid as the functional monomer, trimethylolpropane trimethacrylate as the cross-linking agent, and magnetite as the magnetic component. Extraction can be carried out by blending and stirring water sample, extraction solvent and MMIP. Once the extraction is completed, the MMIP containing the SUHs can be separated from the sample matrix with a magnet. The SUHs desorbed from the polymers were then quantified by capillary liquid chromatography with diode array detection. The limits of quantification are in the range of 0.08 to 0.1 ng mL(-1). Repeatabilities of peak areas and retention times range from 2.9 % to 4.0 % and from 0.1 % to 0.3 %, respectively. The method was successfully applied to the determination of the SUHs bensulfuron-methyl, metsulfuronmethyl, pyrazosulfuron-methyl, thifensulfuron-methyl, and triasulfuron in waste water samples. Recoveries range from 94.3 % to 102.3 %.
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