干旱区生态环境知识资源中心(Arid): Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa

Arid

DOI	10.1016/j.scitotenv.2020.138653
	Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa
	Weideman, Eleanor A.; Perold, Vonica; Ryan, Peter G.
通讯作者	Weideman, EA
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	727
英文摘要	Much of the plastic waste entering the sea is thought to be transported from land by rivers, yet little is known about the distances over which rivers transport plastic. To address this knowledge gap, we collected surface water samples from the Orange-Vaal River at the end of the wet and dry seasons. The Vaal River drains South Africa's main urban-industrial centre, whereas the upper Orange River is sparsely populated. Below their confluence, the river flows through increasingly arid regions with very low human populations before entering the Atlantic Ocean. We collected bulk water samples from 33 bridges to test for microplastic and microfibre (0.025-1 mm) pollution and conducted observations for macrodebris (>50 mm). Where possible, we sampled for plastic fragments (>1 mm) using a neuston net. Microfibres and microplastics were found at every site (1.7 +/- 5.1 L-1, >99% fibres) and accounted for 99% of the number of items recorded. Microfibres and microplastics were particularly abundant in the lower reaches during the period of low flow prior to the wet season flush. Macrodebris and larger microplastics were orders of magnitude less abundant (observations: 0.0002 +/- 0.0007 items.m(-2); neuston net: 0.34 +/- 0.93 items.m(-2)). However, at sites where larger items were found, they comprised most of the mass of plastic. Larger plastics were found mostly at sites in the upper reaches of the Vaal River. Our results suggest that, while the Orange-Vaal River system may be a source of microfibres to the Atlantic Ocean, larger plastic items typically only travel short distances. The Orange-Vaal River system therefore does not appear to be a major source of plastics into the Atlantic Ocean, at least under regular flow conditions. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Land-based sources Mesoplastics Plastic pollution Source-to-sea Surface water
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000537415200002
WOS关键词	MARINE-ENVIRONMENT ; MICROPLASTIC POLLUTION ; SURFACE WATERS ; FRESH-WATER ; LITTER ; DEBRIS ; SEA ; SEDIMENTS ; REMOTE ; SCALE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324598
作者单位	[Weideman, Eleanor A.; Perold, Vonica; Ryan, Peter G.] Univ Cape Town, DST NRF Ctr Excellence, FitzPatrick Inst African Ornithol, ZA-7701 Rondebosch, South Africa
推荐引用方式 GB/T 7714	Weideman, Eleanor A.,Perold, Vonica,Ryan, Peter G.. Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa[J],2020,727.
APA	Weideman, Eleanor A.,Perold, Vonica,&Ryan, Peter G..(2020).Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa.SCIENCE OF THE TOTAL ENVIRONMENT,727.
MLA	Weideman, Eleanor A.,et al."Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa".SCIENCE OF THE TOTAL ENVIRONMENT 727(2020).