Analysis of volatile compounds causing undesirable odors in a polypropylene - high-density polyethylene recycled plastic resin with solid-phase microextraction

Chemosphere
Jon FullerShaoyang Liu

Abstract

Although recycled plastics provide a low-cost and environmentally friendly alternative for many applications, their desirability is significantly limited by the presence of unpleasant odors from volatile organic compounds (VOCs). In this work, a headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) method was optimized to analyze volatile compounds from an odorous recycled plastic resin which was roughly composed of 85-90% polypropylene (PP) and 15-10% high-density polyethylene (HDPE). A large variety of aliphatic hydrocarbons and 13 additive residues were detected. Statistical tools were employed to screen the VOCs and successfully identified three components, i.e., 2,4-dimethyl-heptane, 4-methyl-octane and octamethylcyclotetrasiloxane (D4), which were significantly related to the odor intensity of the recycled plastic resin (p-values < 0.05). 2,4-Dimethyl-heptane has a strong, pungent plastic smell, which is very similar to the odor of the recycled resin. It is identified as a major source of the odor. Past relevant research has not been able to establish a direct link between an odorous compound and the undesirable odor of recycled plastic until now. 4-Methyl-octane was hig...Continue Reading

References

Mar 27, 2009·Journal of the Air & Waste Management Association·Kyoko YamashitaYukio Yanagisawa
Jun 17, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jefferson HopewellEdward Kosior
Jul 7, 2009·Waste Management·S M Al-SalemJ Baeyens

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Citations

Feb 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Xi YuanFusheng Chen

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