Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1217, Issue 10, Pages 1567-1574Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2010.01.010
Keywords
N-Methylimidazolium ionic; liquid-functionalized silica; Sulfonylurea herbicides; Solid-phase extraction; High-performance liquid chromatography
Funding
- Ministry of Science and Technology of China [2008AA10Z420, 2007BAD49B05]
- National Natural Science Foundation of Tianjin [09JCYBC14300]
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A novel material for solid-phase extraction (SPE) was synthesized by chemical immobilization of a functionalized N-methylimidazolium ionic liquid on silica gel. Cartridges packed with the synthetic material were successfully applied to the pre-concentration of trace-level thifensulfuron-methyl, metsulfuron-methyl, chlorsulfuron, sulfometuron-methyl, rimsulfuron, ethametsulfuron, tribenuronmethyl, bensulfuron-methyl, prosulfuron, pyrazosulfuron, chlorimuron-ethyl and primisulfuron from environmental water and soil samples. The 12 sulfonylurea herbicides (SUs) obtained a good resolution in less than 50 min using HPLC with a UV detector. The recovery studies using the ionic liquid-functionalized silica as a sorbent were performed by three consecutive extractions of water and soil samples at two spiked levels. The average recovery for each analyte was in the range of 53.8-118.2% for the water samples and 60.9-121.3% for the soil sample. with RSDs lower than 11.3% in all cases. The ionic liquid-functionalized silica cartridges showed higher selectivity for the SUs than commercially available C-18 cartridges did. (C) 2010 Elsevier B.V. All rights reserved.
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