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Effects of Urban Hydrology on Plastic Transport in a Subtropical River
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-28 , DOI: 10.1021/acsestwater.1c00072
Charlotte J. Haberstroh 1 , Mauricio E. Arias 1 , Zhewen Yin 2 , Michael C. Wang 2, 3
Affiliation  

Temporal and spatial variability are thought to drive river plastic transport, but most field data collections are limited to sporadic sampling at one location, constraining our ability to predict plastic pollution accurately. In this study, we assessed the impact of seasonal and longitudinal variability on river plastic loads collected during 18 months in Florida (USA). We used multipoint cross-sectional sampling, coupling a 500 μm Neuston net with an Acoustic Doppler Currency Profiler at three sites along the river, followed by laboratory measurements and Raman spectroscopy characterization. Annual plastic loads were highly variable, with median values of 1.67 × 109 particles (coefficient of variation [CoV] 89%) or 1.01 tons (CoV 203%) at the river mouth. The impact of urban pollution was evident and persistent in urban sections of the river, where plastic loads were found to be concentration-limited. Drivers of plastic pollution varied along the river; rainfall seasonality dictated transport in the least urbanized sub-watershed, but anthropogenic factors played a greater role in the urban sites. This study is one of the first to shed light on interconnections between plastics, river flow components, and rainfall. Understanding these mechanisms driving plastic pollution provides a tool to manage and reduce plastic in rivers.

中文翻译:

城市水文对亚热带河流塑料运输的影响

时间和空间变异被认为是推动河流塑料运输的驱动因素,但大多数现场数据收集仅限于一个地点的零星采样,这限制了我们准确预测塑料污染的能力。在这项研究中,我们评估了季节性和纵向变化对佛罗里达州(美国)18 个月内收集的河流塑料负荷的影响。我们使用多点横截面采样,在沿河的三个地点将 500 μm Neuston 网与声学多普勒货币剖面仪耦合,然后进行实验室测量和拉曼光谱表征。年度塑性载荷变化很大,中值为 1.67 × 10 9河口的颗粒(变异系数 [CoV] 89%)或 1.01 吨(CoV 203%)。在河流的城市部分,城市污染的影响是明显和持久的,在那里,塑料负荷被发现是浓度有限的。河流沿岸塑料污染的驱动因素各不相同;降雨季节性决定了城市化程度最低的子流域的交通,但人为因素在城市场地中发挥了更大的作用。这项研究是最早阐明塑料、河流流量成分和降雨之间相互联系的研究之一。了解这些导致塑料污染的机制为管理和减少河流中的塑料提供了一种工具。
更新日期:2021-08-13
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