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Column | Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623) |
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Rtx-200 1.3 m, 0.25 mm ID, 0.25 µm (cat.# 15124) | |
Standard/Sample | Tobacco extract with dSPE cleanup |
Injection | |
Inj. Vol.: | 1.0 µL splitless (hold 1.0 min) |
Liner: | Premium 4 mm single taper w/wool (cat.# 23303.5) |
Inj. Temp.: | 250 °C |
Oven | |
Oven Temp.: | Rxi-5Sil MS: 90 °C (hold 1.0 min) to 310 °C at 5 °C/min (hold 2.0 min) Rtx-200: 95 °C (hold 1.0 min) to 315 °C at 5 °C/min (hold 2.0 min) |
Carrier Gas | He, corrected constant flow (2 mL/min) |
Modulation | |
Modulator Temp. Offset: | +20 °C |
Second Dimension Separation Time: | 3 sec |
Hot Pulse Time: | 0.9 sec |
Cool Time between Stages: | 0.6 sec |
Detector | MS |
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Mode: | |
Transfer Line Temp.: | 300 °C |
Analyzer Type: | TOF |
Source Temp.: | 225 °C |
Electron Energy: | 70 eV |
Mass Defect: | -20 mu/100 u |
Ionization Mode: | EI |
Acquisition Range: | 45 to 550 amu |
Spectral Acquisition Rate: | 100 spectra/sec |
Instrument | LECO Pegasus 4D GCxGC-TOFMS |
Sample Preparation | QuEChERS Extraction: A 2 g sample of tobacco was weighed into a 50 mL polypropylene centrifuge tube (cat.# 26239). After the addition of 10 mL of organic-free water to the sample, 100 µL of QuEChERS internal standard mix for GC-MS analysis (cat.# 33267) was added to each sample. Next, 10 mL of acetonitrile was added and the samples were vortexed for 30 min. Immediately after vortexing, pre-packaged QuEChERS European EN 15662 method formulation extraction salts (cat.# 26236) were added to each centrifuge tube. The tubes were immediately shaken for 1 min and then centrifuged for 5 min at 3000 g. Sample Cleanup: A 1 mL aliquot of the extract was fortified with 5 µL of an anthracene standard (cat.# 33264) and added to a dSPE tube containing 150 mg MgSO4, 25 mg PSA and 7.5 mg GCB (cat.# 26218). The tubes were gently shaken for 2 min and then centrifuged for 5 min using a Q-sep 3000 centrifuge (cat.# 26230). A 0.5 mL portion of the supernatant extract was removed and placed into an autosampler vial and 5 µL of a 5% formic acid solution in acetonitrile was added to each sample prior to analysis. |
Notes | Rtx-200 (cat.# 15124) is a 2 m column. A 1.3 m section was cut off and used as the second dimension column. |
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