Combined effects of UV exposure and mechanical abrasion on microplastic fragmentation by polymer types

Title
Combined effects of UV exposure and mechanical abrasion on microplastic fragmentation by polymer types
Author(s)
송영경; 홍상희; 장미; 한기명; Manviri Rani; 정승원; 심원준
KIOST Author(s)
Song, Young Kyoung(송영경)Hong, Sang Hee(홍상희)Jang, Mi(장미)Han, Gi Myung(한기명)Jung, Seung Won(정승원)Shim, Won Joon(심원준)
Publication Year
2015-05-05
Abstract
Fragmented secondary microplastic particles account for the majority of microplastics in the field and have various origins, which makes proper control to be difficult. Scientific information is, however, quite limited, and this hypothesis is not tested yet. Therefore, effects of UV irradiation and (or) mechanical abrasion on fragmentation of polyethylene (PE), polypropylene (PP) and expanded polystyrene (EPS), the top three polymer types in marine debris monitoring study, was evaluated in laboratory condition. The apparent surface damage of PE and PP pellets and EPS spherules exposed to UV for 180 d was observed by SEM, FT-IR microscope and naked eyes. The surface damage of PP was faster than PE. After 120 d, the cracks on the surface of PE could be identified by naked eyes, while, after 60 d, the weakened PP was embrittled and easily broken down and fine cracks appeared. In case of EPS, yellow color appeared on 60 d after UV exposure and the surface was embrittled and started to create the fine particles on the surface. In the only mechanical abrasion experiment for 60 d, the average fragmented particles per bottle produced from PE, PP and EPS were 174±51, 214±14 and 57,339±7,504, respectively. In combination of UV exposure and subsequent mechanical abrasion for 60 d, the mean fragmented particles from PE, PP and EPS were 73±49, 1,442±123 and 723±134, respectively. In case of PE, 60 days of exposure period tois not tested yet. Therefore, effects of UV irradiation and (or) mechanical abrasion on fragmentation of polyethylene (PE), polypropylene (PP) and expanded polystyrene (EPS), the top three polymer types in marine debris monitoring study, was evaluated in laboratory condition. The apparent surface damage of PE and PP pellets and EPS spherules exposed to UV for 180 d was observed by SEM, FT-IR microscope and naked eyes. The surface damage of PP was faster than PE. After 120 d, the cracks on the surface of PE could be identified by naked eyes, while, after 60 d, the weakened PP was embrittled and easily broken down and fine cracks appeared. In case of EPS, yellow color appeared on 60 d after UV exposure and the surface was embrittled and started to create the fine particles on the surface. In the only mechanical abrasion experiment for 60 d, the average fragmented particles per bottle produced from PE, PP and EPS were 174±51, 214±14 and 57,339±7,504, respectively. In combination of UV exposure and subsequent mechanical abrasion for 60 d, the mean fragmented particles from PE, PP and EPS were 73±49, 1,442±123 and 723±134, respectively. In case of PE, 60 days of exposure period to
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25590
Bibliographic Citation
Society of Environmental Toxicology & Chemistry (SETAC), pp.212, 2015
Publisher
Society
Type
Conference
Language
English
Publisher
Society
Related Researcher
Research Interests

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

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