Feng Juanjuan, Sun Min, Bu Yanan, Luo Chuannan
Key Laboratory of Chemical Sensing & Analysis in University of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Key Laboratory of Chemical Sensing & Analysis in University of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
J Chromatogr A. 2015 May 8;1393:8-17. doi: 10.1016/j.chroma.2015.03.022. Epub 2015 Mar 16.
In situ anion exchange has been proved to be an efficient method for facile modification of polymeric ionic liquids (PILs)-based stationary phases. In this work, an on-fiber anion exchange process was utilized to tune the extraction performance of a multi-walled carbon nanotubes (MWCNTs)-poly(1-vinyl-3-octylimidazolium bromide) (poly(VOIm(+)Br(-)))-coated solid-phase microextraction (SPME) fiber. MWCNTs were first coated onto the stainless steel wire through a layer-by-layer fabrication method and then the PILs were coated onto the MWCNTs physically. Anion of the MWCNTs-poly(VOIm(+)Br(-)) fiber was changed into bis(triflroromethanesulfonyl)imide (NTf2(-)) and 2-naphthalene-sulfonate (NapSO3(-)) by on-fiber anion exchange. Coupled to gas chromatography, the MWCNTs-poly(VOIm(+)Br(-)) fiber showed acceptable extraction efficiency for hydrophilic and hydrogen-bonding-donating alcohols, with limits of detection (LODs) in the range of 0.005-0.05μgmL(-1); after the anion exchange with NTf2(-), the obtained MWCNTs-poly(VOIm(+)NTf2(-)) fiber brought wide linear ranges for hydrophobic n-alkanes with correlation coefficient (R) ranging from 0.994 to 0.997; aromatic property of the fiber was enhanced by aromatic NapSO3(-) anions to get sufficient extraction capacity for phthalate esters and halogenated aromatic hydrocarbons. The MWCNTs-poly(VOIm(+)NapSO3(-)) fiber was finally applied to determine several halogenated aromatic hydrocarbons in groundwater of industrial park.
原位阴离子交换已被证明是一种简便修饰基于聚合离子液体（PILs）固定相的有效方法。在本工作中，采用纤维上阴离子交换过程来调节多壁碳纳米管（MWCNTs）-聚（1-乙烯基-3-辛基咪唑溴盐）（聚（VOIm(+)Br(-)））涂层固相微萃取（SPME）纤维的萃取性能。首先通过层层组装法将MWCNTs涂覆在不锈钢丝上，然后将PILs物理涂覆在MWCNTs上。通过纤维上阴离子交换将MWCNTs-聚（VOIm(+)Br(-)）纤维的阴离子转变为双（三氟甲磺酰）亚胺（NTf2(-)）和2-萘磺酸盐（NapSO3(-)）。与气相色谱联用，MWCNTs-聚（VOIm(+)Br(-)）纤维对亲水性和氢键供体醇类显示出可接受的萃取效率，检测限（LODs）在0.005 - 0.05μgmL(-1)范围内；用NTf2(-)进行阴离子交换后，得到的MWCNTs-聚（VOIm(+)NTf2(-)）纤维对疏水性正构烷烃具有宽线性范围，相关系数（R）在0.994至0.997之间；纤维的芳香性通过芳香性NapSO3(-)阴离子得到增强，从而对邻苯二甲酸酯和卤代芳烃具有足够的萃取能力。MWCNTs-聚（VOIm(+)NapSO3(-)）纤维最终应用于测定工业园区地下水中的几种卤代芳烃。
