Table 2.

Gas chromatography conditions

Column	Capillary column, split mode (25 m × 0.32 mm) cross-linked 5% phenyl-methyl silicone or methyl silicone gum
Film thickness	0.17 μm
Detector	Hydrogen flame ionization detector (FID)
Temperatures
Column	190°C, hold 2 min; increase 20°/min to 230°C, hold 3 min; increase 40°/min to 255°C, hold 25 min
Injector	250°C
Detector	300°C
Flow rates
Carrier	2 mL/min, split vent ca 30 mL/min, purge vent ca 3 mL/min helium
Makeup	20 mL/min helium
Hydrogen	35 mL/min
Air	280 mL/min
Injection volume	1 μL