Microplastics in Water Environments: Methods, Occurrence, and Sources

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Quality and Contamination".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 1977

Special Issue Editors


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Guest Editor
College of Environmental Science and Engineering, Nankai University, Tianjin, China
Interests: environmental geochemistry; environmental bioremediation; pollution control of marine and freshwater systems
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Environmental Science and Engineering, Shanxi University of Science and Technology, Xi'an, China
Interests: environmentally friendly polymer; environmental behavior and ecological effect of microplastics; environmental biotechnology

Special Issue Information

Dear Colleagues,

As an emerging contaminants, microplastics of a diameter less than 5mm have been attracting special attention from both academics and government decision-makers since the term was initially coined by Richard C. Thompson in 2004. However, there are lots of opposing arguments regarding microplastics, even when it comes to its very definition. Indeed, the description of a “particle size smaller than 5mm” is different from the common understanding of “micro-”, which describes something with a size between 1 um and 1mm. The concentration unit of microplastics is also kaleidoscopic,  for instance, items/kg, particles/L, pieces/kg, or ug/kg. This means that microplastic data are often not directly comparable. Meanwhile, knowledge regarding the toxicity of microplastics is also debatable. Some scholars have pointed out that microplastics have dual toxicity deriving from themselves and from the pollutant adsorbed on them. Others believe that the toxicity of microplastics is overestimated because of the unrealistically high concentrations used in most bioassay experiments. Furthermore, the understanding of microplastics in different environments is in imbalance, with a significantly larger number studies available on microplastics in sediment and soil than in water.

Therefore, this Special Issue aims to cover the following aspects:

  • Development of innovative methods and approaches for collection, measurement, online monitoring of microplastics;
  • Identification of occurrence and sources of microplastics in water bodies such as lakes, wetland, rivers, and seas;
  • Evaluation of biotoxicity of microplastics, released plasticizer, and adsorbed pollutants;
  • Other themes around environmental behavior and ecological effects of microplastics in water environment, such as migration, transformation, microplastisphere, climatic effect, etc.

Prof. Dr. Xueqiang Lu
Dr. Chengtao Li
Guest Editors

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Keywords

  • microplastics
  • measurement
  • methodology
  • environmental behavior
  • biotoxicity
  • modeling
  • evaluation

Published Papers (1 paper)

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Research

12 pages, 1804 KiB  
Article
Microplastics in the Syr Darya River Tributaries, Uzbekistan
by Yulia Frank, Alijon Khusanov, Mansur Yuldashov, Egor Vorobiev, Svetlana Rakhmatullina, Alexey Rednikin, Sherzodbek Tashbaev, Sarvinoz Mamatkarimova, Kristina Ruchkina, Sirojiddin Namozov, Laziz Turaev, Jobir Sobirov, Akramjon Yuldashev and Danil Vorobiev
Water 2023, 15(20), 3698; https://doi.org/10.3390/w15203698 - 23 Oct 2023
Viewed by 1649
Abstract
The objective of the study was a pre-screening of the microplastic (MP) content in surface water and benthic sediments of Kara Darya and Chirchiq rivers, the first-order tributaries of the Syr Darya River (Uzbekistan). For the first time, surface water and benthic sediment [...] Read more.
The objective of the study was a pre-screening of the microplastic (MP) content in surface water and benthic sediments of Kara Darya and Chirchiq rivers, the first-order tributaries of the Syr Darya River (Uzbekistan). For the first time, surface water and benthic sediment samples were taken from this region, and quantitative screening of MPs 0.15–5.00 mm in size was performed. A combined visual and μRaman-based methodology was used to quantify and characterize artificial polymer microparticles from the surface water and bottom sediments of two rivers. The average abundance of MPs in the Kara Darya River and Chirchiq River waters was found to be 4.28 ± 0.09 and 0.95 ± 0.36 items per m3, and that in benthic sediments attained 244 ± 28.9 and 333 ± 11.5 items per kg of dry soil, respectively. MP concentration in surface water and benthic sediments of the Kara Darya River significantly exceeded (p-value < 0.01) that in the Chirchiq River. Microfibers were most abundant; the proportion of MP fibers in the water of the Kara Darya and Chirchiq rivers amounted to 89 and 95%, respectively, and that in benthic sediments of the rivers was 86 and 84%, respectively. The dominance of microfibers may indicate the route of entry to the rivers through domestic wastewater treatment plant discharges. The polymer microparticles in the surface water and benthic sediments of the Kara Darya and Chirchiq rivers were mainly represented by polyethylenterephtalate (PET), which accounted for half of all MPs detected in the Kara Darya River. Microparticles of textile origin were particularly abundant in the Kara Darya River, where viscose and nylon fibers were also found, which suggests the leading role of synthetic textiles in the pollution. The reported data are the first experimental evidence of MP pollution of the Syr Darya tributaries, but the distribution and circulation of MPs in surface water in Central Asia requires further comprehensive studies. Full article
(This article belongs to the Special Issue Microplastics in Water Environments: Methods, Occurrence, and Sources)
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