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HAO Tian-ying,LIN Qin-bao,ZHONG Huai-ning,et al.Study on the Ability of HS-SPME/GC×GC-Q-TOF MS Combined with Chemometrics to Discriminate Recycled Polyethylene Terephthalate[J].Journal of Instrumental Analysis,2022,41(10):1447-1458. DOI: 10.19969/j.fxcsxb.22030701.
Study on the Ability of HS-SPME/GC×GC-Q-TOF MS Combined with Chemometrics to Discriminate Recycled Polyethylene Terephthalate
A method was established for the discrimination of recycled and virgin polyethylene terephthalate(PET) by head-space solid phase microextraction/comprehensive two-dimensional gas chromatography-quadrupole time-of-flight mass spectrometry(HS-SPME/GC × GC-Q-TOF MS) combined with chemometrics.Firstly,volatile organic compounds(VOCs) of recycled and virgin PET were detected to obtain their peak area data for building discrimination datasets. Then the markers and high-level markers were selected on the basis of orthogonal partial least squares discrimination analysis(OPLS-DA) and ,T,-test.The principal component analysis(PCA) and linear discrimination analysis(LDA) models based on all compounds,markers and high-level markers were established.The results showed that PCA model could well explain the differences between recycled and virgin groups,while the accuracies for calibration and validation sets reached 100% and 97.1% respectively in LDA model.This study indicated that the approach above was accessible,high stable and predictable.Besides,a total of 468 VOCs were detected and identified,of which 31 VOCs were classified as high-level markers.The possible origins of these high-level markers could be food,medicine,cosmetics,pesticides,plastic,industry and unknown sources.
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