Chapter 2

Abstract

It is described in the Dutch test method that a first identification of the additives can be performed by determination of the gas-chromatographic retention times. Therefore we provide the retention times of the additives which could be analysed by GC. The GC analysis was carried out on a Perkin Elmer autosystem XL with the following conditions. The column was a Hewlett Packard Ultra 1 column, 50 m × 0.32 mm with a film thickness of 0.52 (µm of crosslinked methylsiloxane. The temperature program was 5 min at 50°C then raised at 5°C/min to 320°C and held for 26 min. The carrier gas was helium at 3.5 mL/min. The temperature of the injector was 260°C and injections of 1 µL of substance dissolved in diethylether were injected splitless. The flame ionisation detector used was held at 325°C. Under these conditions the retention times of the hydrocarbon markers were 20.1, 38.5 and 45.2 min for C₁₂, C₂₀ and C₂₄ respectively. Retention indexes of the reference substances can be calculated on basis of these retention times [12].