**2.2.1 Gas chromatography and gas chromatography /mass spectrometry**

#### **2.2.1.1 Instrument**

GC: HP 6890 GC/FID (flame ionization detector). GC-MS: HP5890II GC equipped with HP5972 MSD.

## **2.2.1.2 GC parameters**

Column: HP-5 fused silica capillary column (30m×0.25mm×0.25um i.d.), constant flow1.5; Inlet: splitless, temperature 290ºC

Oven: initial 60ºC keep 1 min, 6ºC /m to 290ºC keeps 20 min;

Detector: flame ionization detector (FID), temperature 300ºC.
