xmlns:atom="http://www.w3.org/2005/Atom"
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.
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.
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.