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Mar Pollut Bull. 2019 Apr;141:595-602. doi: 10.1016/j.marpolbul.2019.02.068. Epub 2019 Mar 13.

Characterising the deterioration of different plastics in air and seawater.

Author information

1
Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: nicolas.biber@gmail.com.
2
Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: a.foggo@plymouth.ac.uk.
3
Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: r.c.thompson@plymouth.ac.uk.

Abstract

In situ studies of plastic deterioration can help us understand the longevity of macroplastic as well as the generation of microplastics in the environment. Photo-oxidation contributing to the generation of microplastics in the marine environment was explored using four types of plastic (polyethene, polystyrene, poly(ethylene terephthalate) and Biothene® exposed in light and in shade, in both air and sea water. Metrics for deterioration were tensile extensibility and oxidation rate. Measurements were conducted at intervals between 7 and 600 days' exposure. Deterioration was faster in air than in sea water and was further accelerated in direct light compared to shade. Extensibility and oxidation were significantly inversely correlated in samples exposed in air. Samples in sea water lost extensibility at a slower rate. Polystyrene, which enters the waste stream rapidly due to its wide application in packaging, deteriorated fastest and is, therefore, likely to form microplastics more rapidly than other materials, especially when exposed to high levels of irradiation, for example when stranded on the shore.

KEYWORDS:

FTIR; Natural environment; Photo-oxidation; Plastic deterioration; Polystyrene; Tensile properties

PMID:
30955772
DOI:
10.1016/j.marpolbul.2019.02.068
[Indexed for MEDLINE]

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