Stepnowski Piotr, Nichthauser Joanna
Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Poland.
Anal Sci. 2008 Oct;24(10):1255-9. doi: 10.2116/analsci.24.1255.
The usefulness of ion-pair reagents in selective solid reversed-phase extraction of one N-butyl-4-methylpyridinium and four short-chain alkylimidazolium ionic liquid cations from aqueous media was investigated using various concentrations of alkylsulfonates with different alkyl chain lengths. Final recoveries of the two cations with the shortest alkyl residues were poorer than those of the other, more hydrophobic compounds. Moreover, the recovery values were little affected by the different concentrations of the reagents. In nearly all cases, the best recoveries were obtained with the 1-heptanesulfonate reagent. The analytical performance parameters included excellent linearity over four orders of magnitude, with limits of detection ranging from 0.01 to 0.06 ppm, and very good precision and accuracy. The method was successfully used to extract ionic liquids from spiked seawater and freshwater samples. Recoveries and limits of detection were quite similar to those obtained with preconcentrated standard solutions.
研究了使用不同碳链长度的各种浓度烷基磺酸盐，从水介质中选择性固相反相萃取一种N-丁基-4-甲基吡啶鎓和四种短链烷基咪唑鎓离子液体阳离子时离子对试剂的效用。具有最短烷基残基的两种阳离子的最终回收率低于其他疏水性更强的化合物。此外，回收率受试剂不同浓度的影响很小。几乎在所有情况下，使用1-庚烷磺酸盐试剂可获得最佳回收率。分析性能参数包括四个数量级的出色线性、0.01至0.06 ppm的检测限，以及非常好的精密度和准确度。该方法成功用于从加标海水和淡水样品中萃取离子液体。回收率和检测限与预浓缩标准溶液获得的结果非常相似。
