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Quantification of Recycled PET in Commercial Bottles by IR Spectroscopy and Chemometrics.
- Source :
- Analytica; Jun2024, Vol. 5 Issue 2, p219-232, 14p
- Publication Year :
- 2024
-
Abstract
- A novel approach for the quantification of recycled polyethylene terephthalate (r-PET) in commercial bottles is presented. Fifty-eight bottle samples from several brands and producers containing different percentages of r-PET were purchased from the market. Samples were analyzed by two spectroscopic methods: near-infrared (NIR) spectroscopy and attenuated total reflection (ATR) spectroscopy in the mid-infrared (MIR) region. No chemical pre-treatment was applied before analyses. The spectra were analyzed by partial-least squares (PLS) regression, and two models for NIR and MIR data were computed. Then, a multi-block regression was applied to join the two datasets. All models were validated by cross-validation and by excluding and projecting onto the model the replicated spectra of one sample at a time. Results demonstrated the potential of this approach, especially considering the variability of commercial samples in terms of additives, shape, or thickness of the bottles: for samples close to the centroids of the models (i.e., from 10 to 50% r-PET), the predictions of multi-block method seldom departed from the expected values of ±10%. Only for samples with 0% declared r-PET, the models showed poor prediction abilities. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 26734532
- Volume :
- 5
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Analytica
- Publication Type :
- Academic Journal
- Accession number :
- 178153141
- Full Text :
- https://doi.org/10.3390/analytica5020014