The operating conditions were: injection port temperature, 250 °C; interface temperature, 280 °C; column oven temperature, 100 °C for 5 min, ramped at 20 °C/min to 180 °C, followed by 5 °C/min to 280 °C for 10 min; helium carrier gas (flow rate of 1.0 mL/min); 1 μL injection volume. The split/splitless injector was operated in the splitless mode. The limits of detection showed 0.006 mg/kg for CP.