Combined Effects of UV Exposure Duration and Mechanical Abrasion on Fragmentation Rate and Particle Size Distrubution of Plastics

Title
Combined Effects of UV Exposure Duration and Mechanical Abrasion on Fragmentation Rate and Particle Size Distrubution of Plastics
Author(s)
심원준; 송영경; 홍상희; 장미; 한기명
KIOST Author(s)
Shim, Won Joon(심원준)Song, Young Kyoung(송영경)Hong, Sang Hee(홍상희)Jang, Mi(장미)Han, Gi Myung(한기명)
Publication Year
2016-05-27
Abstract
Photo-oxidation and mechanical abrasion on beaches are thought to be major weathering andfragmentation processes for generating secondary microplastics. None of scientific informationis, however, available so far for fragmentation process of plastics. Fragmentation of top threemarine debris polymer types such as polyethylene (PE), polypropylene (PP), and expandedpolystyrene (EPS) on beach environment were simulated with UV exposure and subsequentaccelerated mechanical abrasion experiment in a laboratory. Each ten of PE, PP and EPS pelletswere exposed in a UV chamber for 0, 2, 6 and 12 months. The UV exposed polymer pellets wereseparately placed by polymer type in amber bottles with pretreated natural sand, and then rotatedwith a roller mixer for 2 month at 35 rpm. Fragmented polymer particles were extracted bydensity separation with deionized water and identified with a fluorescence microscope after NileRed staining. Only two month mechanical abrasion was enough to produce 40,000 micro-sizedparticles of EPS, while less than 100 particles of PE and PP were produced. UV exposureduration significantly affected on total number of the fragmented particles after 2 months for PPand EPS and 6 months for PE. After 12 months of UV exposure and subsequent 2 months ofmechanical abrasion produced total 105,007 particles for EPS, 67,174 for PP, and 201 for PE.The change of fragmentation rate accordingss of plastics. Fragmentation of top threemarine debris polymer types such as polyethylene (PE), polypropylene (PP), and expandedpolystyrene (EPS) on beach environment were simulated with UV exposure and subsequentaccelerated mechanical abrasion experiment in a laboratory. Each ten of PE, PP and EPS pelletswere exposed in a UV chamber for 0, 2, 6 and 12 months. The UV exposed polymer pellets wereseparately placed by polymer type in amber bottles with pretreated natural sand, and then rotatedwith a roller mixer for 2 month at 35 rpm. Fragmented polymer particles were extracted bydensity separation with deionized water and identified with a fluorescence microscope after NileRed staining. Only two month mechanical abrasion was enough to produce 40,000 micro-sizedparticles of EPS, while less than 100 particles of PE and PP were produced. UV exposureduration significantly affected on total number of the fragmented particles after 2 months for PPand EPS and 6 months for PE. After 12 months of UV exposure and subsequent 2 months ofmechanical abrasion produced total 105,007 particles for EPS, 67,174 for PP, and 201 for PE.The change of fragmentation rate according
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24731
Bibliographic Citation
Micro 2016, 2016
Publisher
Micro 2016
Type
Conference
Language
English
Publisher
Micro 2016
Related Researcher
Research Interests

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

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse