Departamento de Química Analítica, Nutrición y Bromatología, Universidad de La Laguna, La Laguna, Tenerife 38206, Spain.
J Chromatogr A. 2010 Feb 19;1217(8):1236-43. doi: 10.1016/j.chroma.2009.12.041. Epub 2009 Dec 21.
The determination of a group of eighteen pollutants in waters, including polycyclic aromatic hydrocarbons and substituted phenols, is conducted in direct-immersion solid-phase microextraction (SPME) using the polymeric ionic liquid (PIL) poly(1-vinyl-3-hexadecylimidazolium) bis[(trifluoromethyl)sulfonyl]imide as a novel coating material. The performance of the PIL fiber coating in the developed IL-SPME-gas chromatography (GC)-mass spectrometry (MS) method is characterized by average relative recoveries of 92.5% for deionized waters and 90.8% for well waters, average precision values (as relative standard deviations, RSD%) of 11% for deionized waters and 12% for well waters, using a spiked level of 5 ng mL(-1). The detection limits oscillate from 0.005 ng mL(-1) for fluoranthene to 4.4 ng mL(-1) for 4-chloro-3-methylphenol, when using an extraction time of 60 min with 20 mL of aqueous sample. The extraction capabilities of the PIL fiber have been compared with the commercial SPME coatings: polydimethylsyloxane (PDMS) 30 microm, PDMS 100 microm and polyacrylate (PA) 85 microm. The PIL fiber is superior to the PDMS 30 microm for all analytes studied. A qualitative study was also carried out to compare among the nature of the coating materials by normalizing the coating thickness. The PIL material was shown to be more efficient than the PDMS material for all analytes studied. The PIL coating was also adequate for nonpolar analytes whereas the PA material was more sensitive for polar compounds.
采用聚合离子液体（PIL）聚（1-乙烯基-3-十六烷基咪唑）双[（三氟甲基）磺酰]亚胺作为新型涂层材料，在直接浸入式固相微萃取（SPME）中对水样中的十八种污染物（包括多环芳烃和取代酚类）进行了测定。通过对去离子水和井水的平均相对回收率为 92.5%和 90.8%、对去离子水和井水的平均精密度值（相对标准偏差，RSD%）为 11%和 12%、在 5ng/mL(-1) 的加标水平下，对 PIL 纤维涂层在开发的 IL-SPME-气相色谱（GC）-质谱（MS）方法中的性能进行了表征。PIL 纤维的检测限在 0.005ng/mL(-1)（荧蒽）和 4.4ng/mL(-1)（4-氯-3-甲基苯酚）之间波动，萃取时间为 60min，水样体积为 20mL。PIL 纤维的萃取能力与商业 SPME 涂层（聚二甲基硅氧烷（PDMS）30μm、PDMS 100μm 和聚丙烯酸酯（PA）85μm）进行了比较。对于所有研究的分析物，PIL 纤维都优于 PDMS 30μm。还通过归一化涂层厚度对涂层材料的性质进行了定性研究。对于所有研究的分析物，PIL 材料都比 PDMS 材料更有效。PIL 涂层对于非极性分析物也是足够的，而 PA 材料对于极性化合物更敏感。
