Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science & Technology, Tianjin 300457, China.
J Chromatogr A. 2010 Mar 5;1217(10):1567-74. doi: 10.1016/j.chroma.2010.01.010. Epub 2010 Jan 14.
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, tribenuron-methyl, 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.
一种新型固相萃取（SPE）材料通过化学固定化功能化的 N-甲基咪唑鎓离子液体在硅胶上合成。用合成材料填充的筒成功地应用于痕量噻吩磺隆甲酯、甲磺隆甲酯、氯磺隆、甲硫隆、玉嘧磺隆、乙嘧磺隆、三氟啶磺隆、苄嘧磺隆、砜嘧磺隆、吡嘧磺隆、氯嘧磺隆乙酯和醚磺隆从环境水样和土壤样品中的预浓缩。使用高效液相色谱法（HPLC）和紫外检测器，在不到 50 分钟的时间内，12 种磺酰脲类除草剂（SUs）得到了很好的分离。使用离子液体功能化硅胶作为吸附剂的回收研究通过在两个加标水平上对水样和土壤样品进行三次连续萃取来进行。对于水样，每种分析物的平均回收率在 53.8-118.2%之间，对于土壤样品，回收率在 60.9-121.3%之间，在所有情况下，RSD 均低于 11.3%。与市售的 C(18)筒相比，离子液体功能化硅胶筒对 SUs 具有更高的选择性。
