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Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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[Microplastic Characteristics and Risk Assessment in Multigate Dam-type River].

Tian-Yi Sun1, Jia-Chen Shen2, Dian-Peng Li1

  • 1School of Life Science, Nanjing University, Nanjing 210023, China.

Huan Jing Ke Xue= Huanjing Kexue
|August 21, 2024
PubMed
Summary

Microplastics present a severe ecological risk in China's Shaying River, with dams not significantly altering their distribution. River sediments act as a sink, but surface water poses a greater ecological threat.

Keywords:
damecological riskmicroplastics（MPs）risk quotientspecies sensitive distribution

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • River Ecology

Background:

  • Microplastic pollution is a growing global concern, particularly in riverine ecosystems.
  • China's extensive dam construction may influence microplastic transport and accumulation.
  • Understanding microplastic dynamics is crucial for assessing ecological risks in freshwater systems.

Purpose of the Study:

  • To investigate microplastic abundance and composition in the Shaying River, focusing on dammed and upstream areas.
  • To evaluate the ecological risk posed by microplastics using established assessment methods.
  • To compare the effectiveness of Species Sensitive Distribution (SSD) and Pollution Load Index (PLI) for risk assessment.

Main Methods:

  • Sampling of surface water and sediments from ten dams and upstream sections of the Shaying River.
  • Analysis of microplastic abundance and polymer types.
  • Ecological risk assessment using Species Sensitive Distribution (SSD) and Pollution Load Index (PLI).

Main Results:

  • The Shaying River faces severe microplastic pollution across its length.
  • Dam construction did not significantly alter microplastic distribution patterns.
  • River sediments serve as a microplastic sink, but surface water exhibited higher ecological risk.
  • SSD assessment provided a better reflection of organismal exposure and feeding behavior compared to PLI.

Conclusions:

  • Microplastic pollution represents a significant ecological threat in the Shaying River, irrespective of dam presence.
  • Sedimentation plays a role in microplastic fate, but surface water contamination warrants greater concern.
  • Species Sensitive Distribution (SSD) is a more sensitive indicator for assessing microplastic ecological risk in riverine environments.