pH-Dependent Equilibrium Isotope Fractionation Associated with the Compound Specific Nitrogen and Carbon Isotope Analysis of Substituted Anilines by SPME-GC/IRMS

Solid-phase microextraction (SPME) coupled to gas chromatography/isotope ratio mass spectrometry (GC/IRMS) was used to elucidate the effects of N-atom protonation on the analysis of N and C isotope signatures of selected aromatic amines. Precise and accurate isotope ratios were measured using polydi...

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Veröffentlicht in:	Analytical chemistry (Washington) 2011-03, Vol.83 (5), p.1641-1648
Hauptverfasser:	Skarpeli-Liati, Marita, Turgeon, Aurora, Garr, Ashley N, Arnold, William A, Cramer, Christopher J, Hofstetter, Thomas B
Format:	Artikel
Sprache:	eng
Schlagworte:	Analytical chemistry Chemistry Chromatographic methods and physical methods associated with chromatography Chromatography Exact sciences and technology Gas chromatographic methods Isotopes Mass spectrometry Nitrogen Spectrometric and optical methods
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Zusammenfassung:	Solid-phase microextraction (SPME) coupled to gas chromatography/isotope ratio mass spectrometry (GC/IRMS) was used to elucidate the effects of N-atom protonation on the analysis of N and C isotope signatures of selected aromatic amines. Precise and accurate isotope ratios were measured using polydimethylsiloxane/divinylbenzene (PDMS/DVB) as the SPME fiber material at solution pH-values that exceeded the pK a of the substituted aniline’s conjugate acid by two pH-units. Deviations of δ15N and δ13C-values from reference measurements by elemental analyzer IRMS were small (
ISSN:	0003-2700 1520-6882
DOI:	10.1021/ac102667y