Department of Analytical Chemistry, University of the Basque Country, Bilbao, Spain.
Anal Chim Acta. 2012 Feb 24;716:119-27. doi: 10.1016/j.aca.2011.12.023. Epub 2011 Dec 20.
The capabilities of four commercially available and low cost polymeric materials for the extraction of polar and non-polar contaminants (logK(ow)=-0.07-6.88, from caffeine to octocrylene, respectively) from water samples was compared. Tested sorbents were polyethersulphone, polypropylene and Kevlar, compared to polydimethylsiloxane as reference material. Parameters that affect the extraction process such as pH and ionic strength of the sample, extraction time and desorption conditions were thoroughly investigated. A set of experimental partition coefficients (K(pw)), at two different experimental conditions, was estimated for the best suited materials and compared with the theoretical octanol-water (K(ow)) partition coefficients of the analytes. Polyethersulphone displayed the largest extraction yields for both polar and non-polar analytes, with higher K(pw) and lower matrix effects than polydimethylsiloxane and polypropylene. Thus, a sorptive microextraction method, followed by large volume injection (LVI) gas chromatography-tandem mass spectrometry (GC-MS/MS), was proposed using the former sorbent (2 mg) for the simultaneous determination of model compounds in water samples. Good linearity (>0.99) was obtained for most of the analytes, except in the case of 4-nonylphenol (0.9466). Precision (n=4) at 50 and 500 ng L(-1) levels was in the 2-24% and limits of detection (LODs) were in the 0.6-25 ng L(-1) range for all the analytes studied.
比较了四种市售且低成本的聚合物材料在从水样中萃取极性和非极性污染物（logK(ow)=-0.07-6.88，分别为咖啡因到辛基三嗪酮）的能力。测试的吸附剂有聚醚砜、聚丙烯和凯夫拉，与聚二甲基硅氧烷作为参考材料相比。还深入研究了影响萃取过程的参数，如样品的 pH 值和离子强度、萃取时间和洗脱条件。为最合适的材料估算了一组在两种不同实验条件下的实验分配系数（K(pw)），并与分析物的理论辛醇-水（K(ow)）分配系数进行了比较。聚醚砜对极性和非极性分析物都显示出最大的萃取产率，与聚二甲基硅氧烷和聚丙烯相比，K(pw)更高，基质效应更低。因此，提出了一种使用前者（2mg）的吸附微萃取方法，随后进行大体积进样（LVI）气相色谱-串联质谱（GC-MS/MS），用于同时测定水样中的模型化合物。除 4-壬基酚（0.9466）外，大多数分析物的线性度（>0.99）都很好。在 50 和 500ngL(-1) 水平的精密度（n=4）为 2-24%，所有研究分析物的检出限（LODs）均在 0.6-25ngL(-1)范围内。
