Ionic liquids as silica deactivating agents in gas chromatography for direct analysis of primary amines in water

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Krzyzaniak, A. and Weggemans, W. and Schuur, B. and Haan, A.B. de (2011) Ionic liquids as silica deactivating agents in gas chromatography for direct analysis of primary amines in water. Journal of Chromatography A, 1218 (50). 9086 - 9090. ISSN 0021-9673

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Abstract:Analysis of primary amines in aqueous samples remains a challenging analytical issue. The preferred approach by gas chromatography is hampered by interactions of free silanol groups with the highly reactive amine groups, resulting in inconsistent measurements. Here, we report a method for direct analysis of aliphatic amines and diamines in aqueous samples by gas chromatography (GC) with silanol deactivation using ionic liquids (ILs). ILs including trihexyl(tetradecyl)phosphonium bis 2,4,4-(trimethylpentyl)phosphinate (Cyphos IL-104), 1-methyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide [pmim][Tf2N] and N″-ethyl-N,N,N′,N′-tetramethylguanidinium tris(pentafluoroethyl)trifluorophosphate [etmg][FAP] were tested as deactivating media for the GC liner. Solutions of these ILs in methanol were injected in the system prior to the analysis of primary amines. Butane-1,4-diamine (putrescine, BDA) was used as a reference amine. The best results were obtained using the imidazolium IL [pmim][Tf2N]. With this deactivator, excellent reproducibility of the analysis was achieved, and the detection limit of BDA was as low as 1 mM. The applicability of the method was proven for the analysis of two different primary amines (C4–C5) and pentane-1,5-diamine
Item Type:Article
Copyright:© 2011 Elsevier
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/81762
Official URL:http://dx.doi.org/10.1016/j.chroma.2011.10.001
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