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Methane‐enhanced negative chemical ionization mass spectrometry of s ‐triazines
Author(s) -
Huang L. Q.,
Mattina M. J. I.
Publication year - 1989
Publication title -
biomedical and environmental mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0887-6134
DOI - 10.1002/bms.1200180929
Subject(s) - ion , fragmentation (computing) , mass spectrometry , chemistry , adduct , chemical ionization , mass spectrum , ionization , analytical chemistry (journal) , quadrupole mass analyzer , methane , chromatography , organic chemistry , computer science , operating system
A Hewlett‐Packard 5988A quadrupole mass spectrometer was tuned systematically using a protocol for establishing the negative chemical ionization (NCI) operating conditions. The methane‐enhanced NCI mass spectra of 22 s ‐triazines were then measured at ion source temperatures of 100°C and 250°C and are reported here. For 20 of the compounds the M −. or [M – 1] − ion was observed. Fragmentation patterns for 2‐Cl, 2‐SCH 3 and 2‐OCH 3 substituted s ‐triazines are contrasted. For the 2‐Cl substituted compounds fragment ions are more abundant at 250°C than at 100°C. For the 2‐SCH 3 substituted s ‐triazines, on the other hand, several fragment ions are noted at greater abundance at 100°C than at 250°C. In addition to the fragment ions observed, a number of unusual adduct ions are noted, including [M + 13] − , [M + 14] − , [M + 25] − and [M + 28] − .