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Occurrence and Composition of Microplastics in the Seabed Sediments of the Coral Communities in Proximity of a Metropolitan Area

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  • Chi Chiu Cheang

    (Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong 999077, China)

  • Yue Ma

    (Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong 999077, China)

  • Lincoln Fok

    (Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong 999077, China)

Abstract

In marine environments, microplastics have become a focus in scientific research in the last decade due to the global threat this pollutant poses to the marine environment. Corals in Hong Kong are under threat due to the degradation of the marine environment caused by human activities. This study investigated the occurrence, abundance and composition of microplastic debris (0.3–5 mm) in seabed sediments adjacent to coral communities in Hong Kong. Twenty-four benthic sediment samples were collected from four study sites located along the northeastern and eastern shores of Hong Kong. Microplastic concentrations ranged from 169 ± 48 to 221 ± 45 items/kg, and the mean concentration of microplastics in the seabed sediments was 189 ± 50 items/kg, which was comparable to similar studies in other regions. Microplastics accounted for 95.4% of particles extracted from benthic sediment samples using 40× light microscopy. ATR-FTIR spectroscopy analysis showed that polyethylene (PE) and polyethylene terephthalate (PET) comprised the majority of polymer types, contributing 45.3% and 29.3%, respectively. The proportion of microplastics made from PE and PET in seabed sediments was significantly higher than that observed in local beach sediments. The proportion of microplastics made from PE and low-density polyethylene (LDPE) and polypropylene (PP) together in the seabed sediments was much higher than that of PET and polyvinyl chloride (PVC). The results have provided information with reference to environmental concentrations of microplastics for fringe reef habitat close to urban areas, which can be applied in studies concerning ecotoxicity of microplastics.

Suggested Citation

  • Chi Chiu Cheang & Yue Ma & Lincoln Fok, 2018. "Occurrence and Composition of Microplastics in the Seabed Sediments of the Coral Communities in Proximity of a Metropolitan Area," IJERPH, MDPI, vol. 15(10), pages 1-12, October.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2270-:d:176042
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    References listed on IDEAS

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    1. Terry P. Hughes & James T. Kerry & Mariana Álvarez-Noriega & Jorge G. Álvarez-Romero & Kristen D. Anderson & Andrew H. Baird & Russell C. Babcock & Maria Beger & David R. Bellwood & Ray Berkelmans & T, 2017. "Global warming and recurrent mass bleaching of corals," Nature, Nature, vol. 543(7645), pages 373-377, March.
    2. Lewis T. O. Cheung & Ching Yee Lui & Lincoln Fok, 2018. "Microplastic Contamination of Wild and Captive Flathead Grey Mullet ( Mugil cephalus )," IJERPH, MDPI, vol. 15(4), pages 1-11, March.
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    Cited by:

    1. Recca E. Sajorne & Genese Divine B. Cayabo & Lea Janine A. Gajardo & Jhonamie A. Mabuhay-Omar & Lota A. Creencia & Hernando P. Bacosa, 2022. "Disentangling Microplastic Pollution on Beach Sand of Puerto Princesa, Palawan Island, Philippines: Abundance and Characteristics," Sustainability, MDPI, vol. 14(22), pages 1-11, November.

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