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Plastics - Styrene/acrylonitrile copolymers - Determination of residual acrylonitrile monomer content - Gas chromatography method
The principle of the method specified is dissolving a test portion in dimethylformamide and injecting a small volume of the solution into a gas chromatograph equipped with flame ionization detector to separate and detect the volatile components.
The solvent contains a known amount of propionitrile or acetonitrile as an internal standard for quantitative evaluation.
With this method, a lower detection limit of the order of 3 ppm of acrylonitrile in the copolymer may be expected.
To obtain a lower detection limit of the order of 0.3 ppm to 0.4 ppm, an alternative method is specified in annex A.
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