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Environmental Processes

, Volume 6, Issue 1, pp 253–264 | Cite as

River Microplastic Contamination and Dynamics upon a Rainfall Event in Hong Kong, China

  • Pui Kwan Cheung
  • Pui Lam Hung
  • Lincoln FokEmail author
Short Communication
  • 115 Downloads

Abstract

Microplastic pollution is a global environmental crisis because of the persistence of plastics in the environment and their direct and indirect threats to a wide spectrum of wildlife. The marine environment is a major sink of plastic debris and rivers are believed to be an important source. However, the microplastic contamination levels and their dynamics in rivers remain poorly understood. This study aims to quantify microplastic abundance and the properties of the microplastics at the surface of an urban river after a rainfall event in Hong Kong. Plastic samples were collected at the river surface after a 3-day rainfall event. The microplastic abundance was 7.428 pieces/m3 (1,615,506 pieces/km2), which was nearly double of that observed on coastal sea surface of the same area (3.973 pieces/m3). Microplastic abundances were found to decrease over ten times (from 14.015 to 1.298 pieces/m3) within 2 hours, suggesting that the temporal distribution of river microplastics was highly dynamic after rainfall. To better understand the microplastic dynamics in river with respect to the rainfall-runoff process, further studies are needed to capture microplastic abundances before, during and after a rainfall event.

Keywords

Microplastics Plastic debris River South China 

Notes

Acknowledgements

This study is financially supported by the Hong Kong SAR Government, Research Grant Council (Early Career Scheme: #859413). The technical support provided by Chui Yiu Ting, Mok Siu Ling Clara, Ng Wan Ying and Po Koon Tai Kelvin is warmly appreciated. We thank Johnson Chau, Cheng Ho Yan, Cheng Nga Chit Crystal and Su Tsz Ki for their assistance in sample collection and analysis. We are grateful to two anonymous reviewers for their constructive comments.

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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of GeographyUniversity of Hong KongHong KongChina
  2. 2.Department of Social SciencesThe Education University of Hong KongHong KongChina
  3. 3.Department of Science and Environmental StudiesThe Education University of Hong KongHong KongChina

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