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ANNEXDETERMINATION OF VINYL CHLORIDE RELEASED BY MATERIALS AND ARTICLES INTO FOODSTUFFS

4.APPARATUS

NB:

An instrument or piece of apparatus is mentioned only if it is special, or made to particular specifications. Usual laboratory apparatus is assumed to be available.

4.1.Gas-chromatograph fitted with automatic headspace sampler or with facilities for manual sample injection.

4.2.Flame ionization detector or other detectors mentioned in point 7.

4.3.Gas-chromatographic column

The column must permit the separation of the peaks of air, of VC and of the internal standard, if used.

Furthermore, the combined 4.2 and 4.3 system must allow the signal obtained with a solution containing 0·005 mg VC/litre DMA or 0·005 mg VC/kg DMA to be equal to at least five times the background noise.

4.4.Sample phials or flasks fitted with silicon or butyl rubber septa

When using manual sampling techniques, the taking of a sample from the headspace with a syringe may cause a partial vacuum to form inside the phial or flask. Hence, for manual techniques where the phials are not pressurized before the sample is taken, the use of large phials is recommended.

4.5.Micro-syringes.

4.6.Gas-tight syringes for manual headspace sampling.

4.7.Analytical balance accurate to 0.1 mg.