Spatiotemporal trends and characteristics of microplastic contamination in a large river-dominated estuary,Environmental Science: Processes & Impacts

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Spatiotemporal trends and characteristics of microplastic contamination in a large river-dominated estuary
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2023-03-20 , DOI: 10.1039/d3em00014a
Md Refat Jahan Rakib ₁ , Sultan Al Nahian ₂ , Reyhane Madadi ₃ , Sayeed Mahmood Belal Haider ₂ , Gabriel Enrique De-la-Torre ₄ , Tony R Walker ₅ , M P Jonathan ₆ , Win Cowger _{7,

8} , Mayeen Uddin Khandaker _{9,

10} , Abubakr M Idris _{11,

12}

Affiliation

Department of Fisheries and Marine Science, Faculty of Science, Noakhali Science and Technology University, Noakhali, Bangladesh.
Bangladesh Oceanographic Research Institute, Ramu, Cox's Bazar, Bangladesh.
Environmental Research Laboratory, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
Grupo de Investigación de Biodiversidad, Medio Ambiente y Sociedad, Universidad San Ignacio de Loyola, Lima, Peru.
School for Resource and Environmental Studies, Dalhousie University, Halifax, Nova Scotia, Canada.
Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio la Laguna Ticomán, Del. Gustavo A. Madero, C. P. 07340, Ciudad de México, Mexico.
Moore Institute for Plastic Pollution Research, Long Beach, California, USA.
University of California, Riverside, Riverside, California, USA.
Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, 47500 Bandar Sunway, Selangor, Malaysia.
Department of General Educational Development, Faculty of Science and Information Technology, Daffodil International University, DIU Rd, Dhaka 1341, Bangladesh.
Department of Chemistry, College of Science, King Khalid University, 61431 Abha, Saudi Arabia.
Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61421, Saudi Arabia.

Microplastic (MP) pollution is a major global issue that poses serious threats to aquatic organisms. Although research on MP pollution has been extensive, the relationship between MPs and water quality parameters in estuarine water systems is unclear. This work studied the spatiotemporal distribution and characteristics of MPs in the Karnaphuli River estuary, Bangladesh. MP abundance was calculated by towing with a plankton net (300 μm mesh size) at three river gradients (up-, mid- and downstream) and the association between physicochemical parameters of water (temperature, pH, salinity, electrical conductivity, total dissolved solids, and dissolved oxygen) and MP distribution patterns was also investigated. Mean MP abundance in water was higher during the wet season (April) (4.33 ± 2.45 items per m³) compared to the dry season (September) (3.65 ± 2.54 items per m³). In descending order, the highest MP abundance was observed downstream (6.60 items per m³) > midstream (3.15 items per m³) > upstream (2.22 items per m³). pH during the wet season (April) and temperature during the dry season (September) were key physicochemical parameters that correlated with river MP abundance (r = −0.74 and 0.74 respectively). Indicating that if the Karnaphuli River water has low pH or high temperature, there is likely to be high MPs present in the water. Most MP particles were film-shaped, white in color, and 1–5 mm in size. Of the six polymers detected, polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), and cellulose were predominant, comprising roughly 17–19% each. These results can be used to model MP transport in the freshwater ecosystem of the Karnaphuli River estuary in Bangladesh to help develop future mitigation strategies.

中文翻译：

大型河口河口微塑料污染的时空趋势和特征

微塑料 (MP) 污染是一个重大的全球性问题，对水生生物构成严重威胁。尽管对 MP 污染的研究已经广泛，但 MP 与河口水系统水质参数之间的关系尚不清楚。这项工作研究了孟加拉国 Karnaphuli 河口 MP 的时空分布和特征。MP 丰度是通过在三个河流梯度（上游、中游和下游）和水的物理化学参数（温度、pH 值、盐度、电导率、总溶解固体）之间用浮游生物网（300 μm 网孔尺寸）拖曳来计算的和溶解氧）和 MP 分布模式也进行了研究。雨季（4 月）水中的平均 MP 丰度较高（4.33 ± 2.45 个项目/m ³) 与旱季（9 月）相比（每立方米 3.65 ± 2.54 件^）。按降序排列，最高 MP 丰度为下游（6.60 项/m ³）> 中游（3.15 项/m ³）> 上游（2.22 项/m ³）。雨季（4 月）的 pH 值和旱季（9 月）的温度是与河流 MP 丰度相关的关键物理化学参数（r= −0.74 和 0.74）。表明如果 Karnaphuli 河水的 pH 值低或温度高，则水中可能存在高 MPs。大多数 MP 颗粒呈薄膜状，颜色为白色，大小为 1-5 毫米。在检测到的六种聚合物中，聚丙烯 (PP)、聚苯乙烯 (PS)、聚对苯二甲酸乙二醇酯 (PET) 和纤维素占主导地位，各占大约 17–19%。这些结果可用于模拟孟加拉国 Karnaphuli 河口淡水生态系统中的 MP 传输，以帮助制定未来的缓解策略。

更新日期：2023-03-20

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