DOI: 10.3724/SP.J.1123.2014.10004

Chinese Journal of Chromatography (色谱) 2015/33:2 PP.182-187

Determination of short chain chlorinated paraffins in polyvinyl chloride plastics by gas chromatography- negative chemical ion/mass spectrometry

A novel method was established to determine short chain chlorinated paraffins (SCCPs) in polyvinyl chloride (PVC) plastics by gas chromatography-negative chemical ion/mass spectrometry (GC-NCI/MS). Ultrasonic extraction was used to extract SCCPs from PVC plastics. The optimal extraction time was 1.5 h, and concentrated sulfuric acid was adopted to purify the extracted solution. Finally, SCCPs in a sample were detected by GC-NCI/MS at 160 ℃ and with methane reagent gas at 1.5 mL/min. This method was not influenced by medium chain chlorinated paraffins (MCCPs) in the sample, and accurate quantitation was made for SCCPs. Twelve batches of samples were analyzed and SCCPs were detected in each batch with the contents from 0.3×102 mg/kg to 3.5×104 mg/kg. With respect to European limitation of SCCPs (1%), four batches of samples did not comply with the European regulation, and they accounted for 33.3%. Obviously, high SCCPs risk was presented in PVC plastics.

Key words:gas chromatography-negative chemical ion/mass spectrometry (GC-NCI/MS),concentrated sulfuric acid,short chain chlorinated paraffins (SCCPs),polyvinyl chloride (PVC) plastics

ReleaseDate:2016-02-04 16:36:59

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