Spatiotemporal distribution and annual load of microplastics in the Nakdong River, South Korea SCIE SCOPUS

Cited 59 time in WEB OF SCIENCE Cited 76 time in Scopus
Title
Spatiotemporal distribution and annual load of microplastics in the Nakdong River, South Korea
Author(s)
Eo, Soeun; Hong, Sang Hee; Song, Young Kyoung; Han, Gi Myung; Shim, Won Joon
KIOST Author(s)
Eo, Soeun(어소은)Hong, Sang Hee(홍상희)Song, Young Kyoung(송영경)Han, Gi Myung(한기명)Shim, Won Joon(심원준)
Publication Year
2019-09
Abstract
Although rivers represent an important pathway for the transport of microplastics to the oceans, research on riverine microplastics is limited compared to the marine environment. Hence, we investigated the spatiotemporal distribution of microplastics in the Nakdong River down to 20 mu m in size and characterized them using Fourier transform infrared spectroscopy in surface and mid waters and sediment. The mean (+/- standard deviation) abundance of microplastic in the Nakdong River was in the range of 293 +/- 83 (upstream, February 2017) to 4760 +/- 5242 (downstream, August 2017) particles/m(3) in water, and 1970 +/- 62 particles/kg in sediment. The abundance of microplastics was about three times higher in surface than mid waters in the downstream area. Polypropylene and polyester accounted for 41.8% and 23.1% of microplastics in the water, respectively, whereas about 50% in the sediment was composed of polypropylene and polyethylene. Microplastics smaller than 300 mu m in size accounted for 74% in the water and 81% in sediment, and the distribution peaked in the 50-150 mu m size range. Based on these results, we estimated the annual load of microplastics carried by the Nakdong River in 2017 to be 5.4-11 trillion by number and 53.3-118 tons by weight. The proportions of the total load transported through surface water and the water column were 8% and 92%, respectively. In addition, the microplastic load was concentrated in the wet season, which makes up 71% in number and 81% in weight. These results indicate that it is necessary to reflect seasonal variation and sample both in the surface water and water column to estimate microplastic transport. Without considering these factors, the annual load of microplastics may be overestimated or underestimated. (C) 2019 Elsevier Ltd. All rights reserved.
ISSN
0043-1354
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/517
DOI
10.1016/j.watres.2019.05.053
Bibliographic Citation
WATER RESEARCH, v.160, pp.228 - 237, 2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Microplastics; Freshwater; River; Sediment; Distribution; Annual load
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

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

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