Pyrolysis—gas chromatography of quaternary ammonium salts in aqueous solution

Simultaneous analysis of quaternary ammonium cations and corresponding halide counterions by pyrolysis gas chromatography / mass spectrometry

“…Accordingly, in all subsequent analysis 300 °C injector port temperature was used. This observed plateau is in good agreement with the results from the literature [19] , where the formation of the tertiary amine from the pyrolysis of QACs in dependence of the injector temperature likewise showed a plateau beginning at approximately 280°C. Compared to the other pyrolysis products, the dialkylmethylamine species provides the highest response and was therefore used for quantitation in all analyses.…”

“…As reported in the literature [19] , [21] , [22] , pyrolysis of quaternary ammonium compounds in the injector of the GC produces tertiary amines and organic halides. So far, this principle has been exploited for the quantitation of the quaternary ammonium cation without taking advantage of the possibility to identify the corresponding anion simultaneously.…”

“…In case of quaternary ammonium compounds, gas chromatography may be possible by pyrolytic conversion of the ammonium salt in the injector port of the gas chromatograph to volatile pyrolysis products [19] , [20] , [21] , [22] . Previous work on the gas chromatographic analysis of pyrolysis products of quaternary ammonium compounds varies in terms of the analytes selected, the matrices, and also the place of pyrolysis (in situ in the injector [19] , [20] , [21] , [22] or offline prior to injection [23] ). Above all, however, the published investigations differ regarding their objectives, thus a direct comparability is only partly possible.…”

“…Above all, however, the published investigations differ regarding their objectives, thus a direct comparability is only partly possible. Some work focused on fundamental aspects of the pyrolysis of selected compounds, which were tested as aqueous solutions [19] , [20] . Nevertheless, injector port pyrolysis of QACs in aqueous solutions has the disadvantage that water significantly stresses the surface of the gas chromatographic separation column.…”

Synthesis and Application of AgBiS2 and Ag2S Nanoinks for the Production of IR Photodetectors

“…Additionally, the intensity of the peak associated with the quaternary ammonium salt decreased with increasing heat treatment temperature. Many quaternary ammonium salts are pyrolyzed at approximately 200 °C; the intensity of the peak associated with the quaternary ammonium salt decreased after the film was heat-treated above 200 °C because the quaternary ammonium salt thermally decomposed …”