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Commission Regulation (EEC) No 2568/91 of 11 July 1991 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis
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The instructions given are for the usual equipment used for gas chromatography, employing capillary columns and a flame-ionisation detector.
The gas chromatograph shall comprise the following elements.
Use an injection system with capillary columns, in which case the injection system should be specially designed for use with such columns. It may be of the split type or the splitless on-column injector type.
The oven shall be capable of heating the capillary column to a temperature of at least 260 °C and of maintaining the desired temperature to within 0,1 °C. The last requirement is particularly important when a fused silica tube is used.
The use of temperature-programmed heating is recommended in all cases, and in particular for fatty acids with less than 16 carbon atoms.
The coatings shall be thin, i.e. 0,1 to 0,2 μm.
Observe the normal precautions for assembling capillary columns, i.e. arrangement of the column in the oven (support), choice and assembly of joints (leak tightness), positioning of the ends of the column in the injector and the detector (reduction of dead-spaces). Place the column under a flow of carrier gas (e.g. 0,3 bar (30 kPa) for a column of length 25 m and internal diameter 0,3 mm).
Condition the column by temperature programming of the oven at 3 °C/min from ambient temperature to a temperature 10 °C below the decomposition limit of the stationary phase. Maintain the oven at this temperature for one hour until stabilisation of the baseline. Return it to 180 °C to work under isothermal conditions.
The syringe shall have a maximum capacity of 10 μl, graduated in 0,1 μl divisions.
Data acquisition system connected online with the detectors and employed with a software program suitable for peak integration and normalisation.]
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