13 Table 3. Quantitative Analysis Results for Each Sample.
*1 Though limonene was not detected, terpinene, a substance similar to limonene, was detected at an adjacent retention time. Sample
Calculated Quantity of Acetaldehyde (μg/g)
Figure 2. TIC Chromatogram of Powder Sample
Pellets Powder Water 1 Water 2
Lemon Tea Orange Juice
2.3 25 63
8.7 23 15
Calculated Quantity of Limonene (ng/g)
96
140 N.D.
N.D. *1 N.D. *1 N.D. *1
Sample Preparation
Calibration curves were prepared by successively diluting samples with acetone solution to seal 2, 20, 100, and 200 μg quantities of acetaldehyde and 20, 100, and 200 ng quantities of limonene in headspace sample vials, and analysing them based on the analytical conditions indicated in Table 2. Calibration curves for acetaldehyde and limonene are shown in Figures 3 and 4 respectively.
Analysis results Figure 3. Acetaldehyde Calibration Curve
Table 3 lists the quantities of acetaldehyde and limonene per gram of sample that resulted from analysing the sample quantities sealed in the respective vials.
Conclusion
Acetaldehyde and limonene in recycled PET material were successfully analysed qualitatively and quantitatively using an HS-GCMS system. From some of the commercial PET bottle samples, terpinene, a substance similar to limonene, was detected by qualitative analysis at a retention time adjacent to that of limonene.
The results show that the freeze-ground powdered state generally extracted a larger quantity of components into the headspace than the pellet state due to the larger surface area of powder.
Thus, the results indicated that HS-GCMS analysis offers an effective technique for confi rming the quality of recycled PET plastics.
References 1. The Council for PET Bottle Recycling
https://www.petbottle-rec.gr.jp/english/
Figure 4. Limonene Calibration Curve
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