Division 4.1

Exactly weigh around 3 g of oil in a glass flask (not to be reused); hermetically seal it. Place it in a thermostat at 70 °C for one hour. Using a syringe carefully remove 0,2 to 0,5 ml of the head space. Inject this into the column of the gas chromatography apparatus regulated as follows:

• injector temperature: 150 °C,

• column temperature: 70 to 80 °C,

• detector temperature: 200 to 250 °C.

Other temperatures may also be used provided the results remain equivalent.