Mid-Level Riverine Outflow Matters: A Case of Microplastic Transport in the Jiulong River, China

Li, Yifan; Liu, Siguang; Li, Mengyang; Huang, Wei; Chen, Kai; Ding, Yongcheng; Wu, Fangzhu; Ke, Hongwei; Lou, Linghao; Lin, Yan; Zhang, Mingyu; Liu, Fengjiao; Wang, Chunhui; Cai, Meijun

doi:10.3389/fmars.2021.712727

Cited by 17 publications

(5 citation statements)

References 59 publications

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“…Assessing MPs in multiple trophic levels and understanding trophic transfer in organisms is important in considering MP transfer to humans and its impacts on health in this region. When referring to the exposure to human health, only two papers focused on the effect of MP pollution on human health [69,70]. Li et al [69] investigated the joint cytotoxicity of two different MPs co-exposed with diverse ionic pollutants in two cell lines from the human digestive system: human gastric epithelium (GES-1) and colorectal mucosa (FHC) cell lines.…”

Section: Discussionmentioning

confidence: 99%

“…When referring to the exposure to human health, only two papers focused on the effect of MP pollution on human health [69,70]. Li et al [69] investigated the joint cytotoxicity of two different MPs co-exposed with diverse ionic pollutants in two cell lines from the human digestive system: human gastric epithelium (GES-1) and colorectal mucosa (FHC) cell lines. Also, their finding indicated that the cytotoxicity of cationic pollutants was alleviated by MPs more significantly than that of anionic pollutants in both culture medium and river water.…”

Section: Discussionmentioning

confidence: 99%

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Microplastics in Freshwater Environment in Asia: A Systematic Scientific Review

Kumar

Inamura

Bao

et al. 2022

Water

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Microplastics (MPs) are an emerging pollutant in the aquatic environment, and this has gradually been recognized in the Asian region. This systematic review study, using the Scopus database, provides an insightful understanding of the spatial distribution of scientific studies on MPs in freshwater conducted across the Asian region, utilized sampling methods, and a detailed assessment of the effects of MPs on different biotic components in freshwater ecosystems, with special focus on its potential risks on human health. The results of this review indicate that research on microplastics in Asia has gained attention since 2014, with a significant increase in the number of studies in 2018, and the number of scientific studies quadrupled in 2021 compared to 2018. Results indicated that despite a significant amount of research has been conducted in many Asian countries, they were not distributed evenly, as multiple studies selected specific rivers and lakes. Additionally, around two-thirds of all the papers focused their studies in China, followed by India and South Korea. It was also found that most of the studies focused primarily on reporting the occurrence levels of MPs in freshwater systems, such as water and sediments, and aquatic organisms, with a lack of studies investigating the human intake of MPs and their potential risks to human health. Notably, comparing the results is a challenge because diverse sampling, separation, and identification methods were applied to estimate MPs. This review study suggests that further research on the dynamics and transport of microplastics in biota and humans is needed, as Asia is a major consumer of seafood products and contributes significantly to the generation of plastic litter in the marine environment. Moreover, this review study revealed that only a few studies extended their discussions to policies and governance aspects of MPs. This implies the need for further research on policy and governance frameworks to address this emerging water pollutant more holistically.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Microplastics in Freshwater Environment in Asia: A Systematic Scientific Review

Kumar

Inamura

Bao

et al. 2022

Water

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“…The microscope resolution was limited to a minimum particle size of 45 μm, and the size was determined using the maximum length of each particle (including fibers). The number of MPs present in each photograph was then calculated manually and obtained by integration, after which they were classified according to their normalized sizes, colors, and shapes (Figure 3) (Li et al, 2021a). However, visual observation alone cannot fully and accurately identify MPs (Silva et al, 2018).…”

Section: Sampling and Analysis Methodsmentioning

confidence: 99%

“…In addition, the river flow varied in different seasonal periods. During the wet season, a large amount of rainfall-runoff washed away a large number of MPs (Li et al, 2021a), which might lead to the dilution of MPs (Liu et al, 2021). Rivers were known to be the major pathways for the deposition of MPs in the adjacent oceans (Lebreton et al, 2017;Zhu et al, 2019).…”

Section: Degree Of Pollution Of Mps Transported To the Sea In Zjbmentioning

confidence: 99%

Tracing Land-Based Microplastic Sources in Coastal Waters of Zhanjiang Bay, China: Spatiotemporal Pattern, Composition, and Flux

Wang

Jian²,

Zhang³

et al. 2022

Front. Mar. Sci.

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Estuaries and sewage outlets are key pathways for the transport of microplastics (MPs) from land to coastal waters. In this study, the spatiotemporal pattern, composition, and flux of MPs transported from land to Zhanjiang Bay (ZJB) in the South China Sea were investigated. The results showed that the overall mean MP abundance (± standard deviation) was 17.99 ± 9.72 items/L, with the highest in the normal season, followed by the dry and wet seasons. Fibers were the most dominant shape in these samples, blue was the most common color, and most MPs ranged between 100 and 330 μm. The MP diversity was higher in the wet and normal seasons than in the dry season. The highest seasonal flux of MPs was observed during the wet season, accounting for 79.68%, with the largest contribution from the Suixi River. There was a significant positive relationship between the annual MP flux and river discharge (R² = 0.95, p< 0.001). Hydrological processes, human behavior, and weather conditions were key factors that contributed toward the spatiotemporal variation of MPs. Overall, the aim of this study was to provide baseline information on MP pollution in ZJB to help formulate control strategies for improving regional water quality and mitigating its pollution. In the future, this study can be used to assess the role of river basins and sewage outlets in transporting MPs to the estuaries and ocean.

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“…PE particles extensively exist in water ways and migration through surface waters has been determined to be significant (Teng et al., 2020). While generally microplastics can come in various shapes, the dominant shape of PE particles is as a roughly spherical or cylindrical piece of plastic debris (Li et al., 2021), shown as Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Markovian Models for Microplastic Transport in Open‐Channel Flows

Xing

Bolster

Liu

et al. 2022

Water Resources Research

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Plastic is used extensively in products used in our daily lives due to attributes such as portability, flexibilty, economy, toughness, and resistance to corrosion. However, some attributes, such as a long lifetime and persistence, can cause environmental issues, including adverse impacts on water systems. It has been estimated that between 4.8 and 12.7 million metric tons of plastic debris entered the marine ecosystem in 2010 (Jambeck et al., 2015). Much of this has or takes the form of plastic particles smaller than 5 mm in size-classified as microplastics (Arthur et al., 2008)-which are potentially toxic in an aquatic environment and a major concern of environmental researchers (Gong & Xie, 2020;Sighicelli et al., 2018;Zhang et al., 2017). Indeed, many studies have demonstrated microplastic detection in surface waters (Zhao et al., 2015), water columns (Nel & Froneman, 2015), and surrounding sediments (Browne et al., 2011). In particular, flows in riverine systems are an important pathway for microplastic pollution (Murphy et al., 2016), which can persist for decades due to plastics' natural longevity, and other hazardous substances (e.g., heavy metals, organic pollutants) can be released during the aging of plastic debris (Koelmans et al., 2014). Furthermore, other toxins and pollutants can be absorbed by microplastics, which act as carriers to enable transport over much longer distances than in their absence (Guo et al., 2012;Hüffer & Hofmann, 2016). Physical properties, such as density or shape, of microplastics detected in water may vary significantly depending on the category of polymer and duration of its exposure in the environment (Khatmullina & Isachenko, 2017). These properties play an important role on how microplastics interact with the flow (e.g., buoyancy, drag) (Xuan & Jwa, 2019). As an important example, polyethylene (PE, ρ p = 0.956 kg/m 3 ) in many forms is widely used in the manufacturing of film, packaging materials, containers and other common uses. In recent years, PE has become the largest category of the total plastic production, accounting for 36% (Geyer et al., 2017). PE particles extensively exist in water ways and migration through surface waters has been determined to be significant (Teng et al., 2020). While generally microplastics can come in various shapes, the dominant shape of PE particles is as a roughly spherical or cylindrical piece of plastic debris (Li et al., 2021), shown as Figure 1.

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Mid-Level Riverine Outflow Matters: A Case of Microplastic Transport in the Jiulong River, China

Cited by 17 publications

References 59 publications

Microplastics in Freshwater Environment in Asia: A Systematic Scientific Review

Microplastics in Freshwater Environment in Asia: A Systematic Scientific Review

Tracing Land-Based Microplastic Sources in Coastal Waters of Zhanjiang Bay, China: Spatiotemporal Pattern, Composition, and Flux

Markovian Models for Microplastic Transport in Open‐Channel Flows

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