Head-Space SPME for the Analysis of Organophosphorus Insecticides by Novel Silica IL-Based Fibers in Real Samples

This work demonstrates the suitability of a newly developed ionic liquid (IL)-based silica SPME fiber for the determination of seven organophosphorus insecticides in cucumber and grapefruit samples by headspace solid-phase microextraction (HS-SPME) with a gas chromatography–flame ionization detector (FID). The sol-gel method released four different sorbent coatings, which were obtained based on a silica matrix containing ILs immobilized inside its pores. In order to obtain ionogel fibers, the following ionic liquids were utilized: 1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide; Butyltriethyl ammonium bis(trifluoromethylsulfonyl)imide; 1-(2-Methoxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-Benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The developed fibers were applied for the extraction of seven different insecticides from liquid samples. The most important extraction parameters of HS-SPME coupled with the GC-FID method were optimized with a central composite design. The new SPME fiber demonstrated higher selectivity for extracting the analyzed insecticides compared with commercially available fibers. The limit of detection was in the range of 0.01–0.93 μg L−1, the coefficients of determination were >0.9830, and 4.8–10.1% repeatability of the method was found. Finally, the obtained ionogel fibers were utilized to determine insecticides in fresh cucumber and grapefruit juices

Polymeric metal‐containing ionic liquid sorbent coating for the determination of amines using headspace solid‐phase microextraction

This study describes the design, synthesis, and application of polymeric ionic liquid sorbent coatings featuring nickel metal centers for the determination of volatile and semi‐volatile amines from water samples using headspace solid‐phase microextraction. The examined polymeric ionic liquid sorbent coatings were composed of two ionic liquid monomers (tetra(3‐vinylimidazolium)nickel bis[(trifluoromethyl)sulfonyl]imide [Ni2+(VIM)4] 2[NTf2–] and 1‐vinyl‐3‐hexylimidazolium [HVIM+][NTf2–]), and an ionic liquid crosslinker (1,12‐di(3‐vinylimidazolium)dodecane [(VIM)2C122+] 2[NTf2–]). With these ionic liquid monomers and crosslinkers, three different types of coatings were prepared: PIL 1 based on the neat [Ni2+(VIM)4] 2[NTf2–] monomer; PIL 2 consisting of the [Ni2+(VIM)4] 2[NTf2–] monomer with addition of crosslinker, and PIL 3 comprised of the [HVIM+][NTf2–] monomer and crosslinker. Analytical performance of the prepared sorbent coatings using headspace solid‐phase microextraction GC‐MS was compared with the polydimethylsiloxane and polyacrylate commercial coatings. The PIL 2 sorbent coating yielded the highest enrichment factors ranging from 5500 to over 160000 for the target analytes. The developed headspace solid‐phase microextraction GC‐MS method was applied for the analysis of real samples (the concentration of amines was 200 μg L–1), producing relative recovery values in the range of 90.9‐120.0 % (PIL 1) and 83.0‐122.7 % (PIL 2) from tap water, and 84.8‐112.4 % (PIL 1) and 79.2‐119.3 % (PIL 2) from lake water.This is the peer-reviewed version of the following article: Yavir, Kateryna, Philip Eor, Adam Kloskowski, and Jared L. Anderson. "Polymeric metal‐containing ionic liquid sorbent coating for the determination of amines using headspace solid‐phase microextraction." Journal of Separation Science (2021), which has been published in final form at DOI: 10.1002/jssc.202100119. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Posted with permission.</p

Polymeric metal‐containing ionic liquid sorbent coating for the determination of amines using headspace solid‐phase microextraction

This study describes the design, synthesis, and application of polymeric ionic liquid sorbent coatings featuring nickel metal centers for the determination of volatile and semi‐volatile amines from water samples using headspace solid‐phase microextraction. The examined polymeric ionic liquid sorbent coatings were composed of two ionic liquid monomers (tetra(3‐vinylimidazolium)nickel bis[(trifluoromethyl)sulfonyl]imide [Ni2+(VIM)4] 2[NTf2–] and 1‐vinyl‐3‐hexylimidazolium [HVIM+][NTf2–]), and an ionic liquid crosslinker (1,12‐di(3‐vinylimidazolium)dodecane [(VIM)2C122+] 2[NTf2–]). With these ionic liquid monomers and crosslinkers, three different types of coatings were prepared: PIL 1 based on the neat [Ni2+(VIM)4] 2[NTf2–] monomer; PIL 2 consisting of the [Ni2+(VIM)4] 2[NTf2–] monomer with addition of crosslinker, and PIL 3 comprised of the [HVIM+][NTf2–] monomer and crosslinker. Analytical performance of the prepared sorbent coatings using headspace solid‐phase microextraction GC‐MS was compared with the polydimethylsiloxane and polyacrylate commercial coatings. The PIL 2 sorbent coating yielded the highest enrichment factors ranging from 5500 to over 160000 for the target analytes. The developed headspace solid‐phase microextraction GC‐MS method was applied for the analysis of real samples (the concentration of amines was 200 μg L–1), producing relative recovery values in the range of 90.9‐120.0 % (PIL 1) and 83.0‐122.7 % (PIL 2) from tap water, and 84.8‐112.4 % (PIL 1) and 79.2‐119.3 % (PIL 2) from lake water