T/GIQA 1-2024 Regenerated plastic identification test method - Headspace gas chromatography-mass spectrometry

Scope

Scope: This document specifies a headspace gas chromatography-mass spectrometry method for identifying post-consumption physically recycled polyethylene terephthalate (PET) plastic materials and virgin PET plastic materials, which can be used to determine whether a sample is a recycled PET plastic material obtained through a physical recycling process. Main technical content: 1. Method principle; 2. Reagents and materials: 2.1 Standards; 2.2 Reagents; 3. Instruments and equipment: 3.1 Gas chromatograph-mass spectrometer; 3.2 Headspace vial; 3.3 Dewar flask; 3.4 High-speed rotary mill; 3.5 Analytical balance; 4. Volatile component analysis: 4.1 Solution preparation; 4.2 Sample preparation; 4.3 Instrument reference conditions; 4.4 Sample analysis; 5. Data processing: 5.1 Extraction of volatile component chromatogram peak information; 5.2 Calculation of retention index; 5.3 Summarization of volatile component peak areas; 5.4 Calculation of relative peak areas; 5.5 Normalization of relative peak areas; 6. Identification of virgin and recycled PET: 6.1 Screening of characteristic volatile components; 6.2 Establishment and validation of identification models; 6.3 Identification of unknown samples

Development Information

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