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A Varian (Walnut Creek, CA) 8200 auto sampler 3400cx gas chromatograph Saturn 2000 ion trap mass spectrometer was used in electron ionization mode (GC/EI/MS), positive chemical ionization mode (GC/PCI/MS), and positive chemical ionization tandem mass spectrometry mode (GC/PCI/MS/MS). 99.999% purity methane... 顯示更多 A Varian (Walnut Creek, CA) 8200 auto sampler 3400cx
gas chromatograph Saturn 2000 ion trap mass spectrometer
was used in electron ionization mode (GC/EI/MS), positive
chemical ionization mode (GC/PCI/MS), and positive
chemical ionization tandem mass spectrometry mode
(GC/PCI/MS/MS). 99.999% purity methane reagent gas
(Air Products, Allentown, PA) was used in GC/PCI/MS
and GC/PCI/MS/MS modes. A 25m×0.25mm×0.25um
EquityTM-1 GC column from Supelco (Bellefonte, PA) was
used in conjunction with a SiltekTM-deactivated splitless
liner from Restek (Bellefonte, PA). The GC temperature program
used was 80–115 ◦C at a rate of 10 ◦C/min followed
by 115–234 ◦C at 15◦C/min with a hold for 1.34 min. The
transfer line and manifold temperatures remained at 280 and
120 ◦C, respectively for all experiments. A 1 L amount of
sample was injected via auto sampler and an acetonitrile
blank (Fisher Chemicals, HPLC grade, Fair Lawn, NJ) was
run before each sample injection.

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