期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1217, 期 38, 页码 5875-5882出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2010.07.011
关键词
Stainless steel fiber; Molecularly imprinted polymer; Solid-phase microextraction; Metolachlor
资金
- National Natural Science Foundation of China [20905026]
A molecularly imprinted polymer (MIP) with metolachlor as template was firstly coated on stainless steel fiber through chemical bonding strategy to solve the fragility problem of silica fiber substrate for solid-phase microextraction. The surface pretreatment of stainless steel fiber and the polymerization conditions were investigated systematically to enhance the preparation feasibility and MIP coating performance, and then a porous and highly cross-linked MIP coating with 14.8-mu m thickness was obtained with over 200 times re-usability which was supported by non-fragile stainless steel fiber adoption. The MIP coating possessed specific selectivities to metolachlor, its metabolites and other chloroacetanilide herbicides with the factors of 1.1-4.6. Good extraction capacities of metolachlor, propisochlor and butachlor were found with MIP coating under quick adsorption and desorption kinetics, and the detection limits of 3.0,9.6 and 38 mu g L-1 were achieved, respectively. Moreover, the MIP-coated stainless steel fiber was evaluated for trace metolachlor, propisochlor and butachlor extraction in the spiked soybean and corn samples, and the enrichment factors of 54-60, 27-31 and 15-20 were obtained, respectively. (C) 2010 Elsevier B.V. All rights reserved.
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