Fragmentation of plastics by accelerated chemical and physical weathering

Title
Fragmentation of plastics by accelerated chemical and physical weathering
Author(s)
송영경; 심원준; 홍상희; 한기명; 정승원
KIOST Author(s)
Shim, Won Joon(심원준)Hong, Sang Hee(홍상희)Han, Gi Myung(한기명)Jung, Seung Won(정승원)
Publication Year
2016-10-26
Abstract
Photo-oxidation and mechanical abrasion are thought to be major weathering andfragmentation processes for generating secondary microplastics. None of scientificinformation is, however, available so far for fragmentation process of plastics.Fragmentation of polyethylene (PE), polypropylene (PP), and expanded polystyrene (EPS)on beach environment was simulated with UV exposure and subsequent mechanicalabrasion in laboratory accelerated experiments. Each ten of PE, PPand EPS pellets wereexposed to UV in a chamber for 0, 2, 6 and 12 months. The non-UV exposed (UV0) andUV exposed polymer pellets (UV2, 6 and 12) were separately placed by polymer type asthree replicates in amber bottles with pre-treated natural sand, and then rotated with aroller mixer at 36-38 rpm for 2 months. Fragmented polymer particles were extracted bydensity separation with deionized water and identified with a fluorescence microscope afterNile Red staining. Only two month mechanical abrasion was enough to produce 40,000micro-sized particles of EPS, while less than 100 particles of PE and PP were produced.UV exposure duration significantly affected on total number of the fragmented particlesafter 6 months for EPS and 12 months for PE and PP. the mean (±SD) number ofparticles produced per bottle after 12 months of UV exposure and subsequent 2 months ofmechanical abrasion were 105,008±17,182 for EPS, 60,841±10,605 foics.Fragmentation of polyethylene (PE), polypropylene (PP), and expanded polystyrene (EPS)on beach environment was simulated with UV exposure and subsequent mechanicalabrasion in laboratory accelerated experiments. Each ten of PE, PPand EPS pellets wereexposed to UV in a chamber for 0, 2, 6 and 12 months. The non-UV exposed (UV0) andUV exposed polymer pellets (UV2, 6 and 12) were separately placed by polymer type asthree replicates in amber bottles with pre-treated natural sand, and then rotated with aroller mixer at 36-38 rpm for 2 months. Fragmented polymer particles were extracted bydensity separation with deionized water and identified with a fluorescence microscope afterNile Red staining. Only two month mechanical abrasion was enough to produce 40,000micro-sized particles of EPS, while less than 100 particles of PE and PP were produced.UV exposure duration significantly affected on total number of the fragmented particlesafter 6 months for EPS and 12 months for PE and PP. the mean (±SD) number ofparticles produced per bottle after 12 months of UV exposure and subsequent 2 months ofmechanical abrasion were 105,008±17,182 for EPS, 60,841±10,605 fo
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24485
Bibliographic Citation
2016년도 추계해양학회, pp.249, 2016
Publisher
한국해양학회
Type
Conference
Language
English
Publisher
한국해양학회
Related Researcher
Research Interests

Microplastic pollution,Persistent Organic Pollutants,Oil Pollution,미세플라스틱 오염,잔류성 유기오염물질,유류오염

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