Department of Chemistry, Iowa State University, Ames, IA 50011 USA.
Department of Chemistry, Iowa State University, Ames, IA 50011 USA.
Talanta. 2018 May 15;182:74-82. doi: 10.1016/j.talanta.2018.01.052. Epub 2018 Feb 20.
A double-confined polymeric ionic liquid (PIL) sorbent coating was fabricated for the determination of nine ultraviolet (UV) filters in sample solutions containing high salt content by direct immersion solid-phase microextraction (DI-SPME) coupled to high-performance liquid chromatography (HPLC). The IL monomer and crosslinker cations and anions, namely, 1-vinyl-3-decylimidazolium styrenesulfonate ([VImC][SS]) and 1,12-di(3-vinylbenzylimidazolium) dodecane distyrenesulfonate ([(VBIm)C] 2[SS]), were co-polymerized to create a highly stable sorbent coating which allowed for up to 120 direct-immersion extractions in 25% NaCl (w/v) solution without a decrease in its extraction capability. Extraction and desorption parameters such as desorption solvent, agitation rate, extraction time, desorption solvent volume, and desorption time were evaluated and optimized. The analytical performance of the styrenesulfonate anion-based PIL fiber, PIL fiber containing chloride anions, and a commercially available polydimethylsiloxane/divinylbenzene (PDMS/DVB) fiber were compared. Coefficients of determination (R) for the styrenesulfonate anion-based PIL fiber ranged from 0.995 to 0.999 and the limits of detection (LODs) varied from 0.1 to 5 µg L. The developed method was successfully applied in real water samples including tap, pool, and lake water, and acceptable relative recovery values were obtained. The lifetime of the PIL fiber containing chloride anions as well as the PDMS/DVB fiber were considerably shorter than the PIL fiber containing the styrenesulfonate anion, with both fibers showing a notable decrease in reproducibility and significant damage to the sorbent coating surface after 40 and 70 extractions, respectively. The R values for the chloride anion containing PIL fiber were at or higher than 0.991 with LODs ranging from 0.5 to 5 µg L. For the PDMS/DVB fiber, R values ranged from 0.992 to 0.999 and LODs were found to be as low as 0.2 µg L and as high as 5 µg L.
一种双约束聚合离子液体（PIL）吸附剂涂层被制备用于在含有高盐含量的样品溶液中通过直接浸入式固相微萃取（DI-SPME）与高效液相色谱（HPLC）结合来测定九种紫外线（UV）过滤器。IL 单体和交联剂阳离子和阴离子，即 1-乙烯基-3-癸基咪唑𬭩苯乙烯磺酸盐([VImC][SS])和 1,12-二(3-乙烯基苄基咪唑𬭩)十二烷二苯乙烯磺酸盐([(VBIm)C] 2[SS])，被共聚以形成一种高度稳定的吸附剂涂层，允许在 25%（w/v）NaCl 溶液中进行多达 120 次直接浸入萃取，而不会降低其萃取能力。评估和优化了萃取和解吸参数，如解吸溶剂、搅拌速度、萃取时间、解吸溶剂体积和解吸时间。比较了苯乙烯磺酸盐阴离子基 PIL 纤维、含氯离子的 PIL 纤维和市售的聚二甲基硅氧烷/二乙烯基苯（PDMS/DVB）纤维的分析性能。苯乙烯磺酸盐阴离子基 PIL 纤维的决定系数（R）范围为 0.995 至 0.999，检出限（LOD）范围为 0.1 至 5μg/L。所开发的方法成功应用于实际水样，包括自来水、游泳池和湖水，获得了可接受的相对回收率值。含氯离子的 PIL 纤维和 PDMS/DVB 纤维的寿命明显短于含苯乙烯磺酸盐阴离子的 PIL 纤维，在分别进行 40 次和 70 次萃取后，这两种纤维的重现性显著下降，吸附剂涂层表面明显受损。含氯离子的 PIL 纤维的 R 值在 0.991 或更高，LOD 范围为 0.5 至 5μg/L。对于 PDMS/DVB 纤维，R 值范围为 0.992 至 0.999，LOD 低至 0.2μg/L，高至 5μg/L。
