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Contamination and Ecological Risk Evaluation of Metals in Sediments from a Wetland of International Importance (Ramsar Site)

Author

Listed:
  • Md. Moudud Ahmed

    (Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh)

  • As-Ad Ujjaman Nur

    (Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh)

  • Yeasmin N. Jolly

    (Atmospheric and Environmental Chemistry Laboratory, Chemistry Division, Atomic Energy Centre, Dhaka 1000, Bangladesh)

  • Md. Rakeb Ul Islam

    (Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh)

  • Mohammad Saifur Rahman

    (Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh)

  • Shirin Akter

    (Atmospheric and Environmental Chemistry Laboratory, Chemistry Division, Atomic Energy Centre, Dhaka 1000, Bangladesh)

  • Jimmy Yu

    (School of Engineering and Built Environment, Griffith University, Brisbane, QLD 4111, Australia)

  • Mohammed Fahad Albeshr

    (Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia)

  • Takaomi Arai

    (Environmental and Life Sciences Programme, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam)

  • Mohammad Belal Hossain

    (Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
    School of Engineering and Built Environment, Griffith University, Brisbane, QLD 4111, Australia)

Abstract

Wetlands are highly productive and diverse ecosystems providing home to thousands of organisms. These ecosystems reduce water pollution, sequester carbon, support livelihoods, and increase food security. However, these ecological functions are being impeded due to increased levels of metals in the environment. Therefore, the primary objective of this study was to evaluate the degree of metal contamination in the surface sediment of a wetland, Tanguar Haor, for the first time. The result demonstrated that the mean concentrations of Fe, Cu, Zn, As, Pb and Hg varied from 13140.39 to 45675, 40.07 to 46.29, 47.60 to 57.15, 18.89 to 35.23, 1.24 to 2.64, and 0.35 to 0.42, respectively. The concentration of As was found to be higher than the average shale value. The concentration of Cu (44.19 μg/g) and Hg (0.38 μ/g) was very close to the shale value (45 μg/g and 0.40 μg/g, respectively), indicating a moderate level of contamination. The contamination level was further evaluated by multi-indices, e.g., the contamination factor (CF), the enrichment factor (EF), and the geo-accumulation index ( I geo ). The average EF values for As (115.41), Cu (57.68), and Hg (55.47) were >50, indicating a high degree of contamination (extremely severe enrichment). However, CF values showed varied levels of pollution; for example, the majority of the area was only somewhat contaminated with As, Cu, and Hg, but less contaminated with Fe, Zn, and Pb. According to I geo , sampling sites were found to be unpolluted or less polluted by heavy metals. Based on potential ecological risk assessment (PERI), the degree of risk from the six heavy metals decreased in the following sequence: As > Cu > Zn > Pb > Cr > Ni. PERI values indicated the study area has been exposed to moderate risk to As and low risk to other metals. This study provides an opportunity for frequent monitoring of heavy metals in this ecologically critical environment, and thus curbing heavy metal pollution.

Suggested Citation

  • Md. Moudud Ahmed & As-Ad Ujjaman Nur & Yeasmin N. Jolly & Md. Rakeb Ul Islam & Mohammad Saifur Rahman & Shirin Akter & Jimmy Yu & Mohammed Fahad Albeshr & Takaomi Arai & Mohammad Belal Hossain, 2023. "Contamination and Ecological Risk Evaluation of Metals in Sediments from a Wetland of International Importance (Ramsar Site)," Sustainability, MDPI, vol. 15(10), pages 1-13, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:10:p:7753-:d:1142521
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    References listed on IDEAS

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    1. Etienne Fluet-Chouinard & Benjamin D. Stocker & Zhen Zhang & Avni Malhotra & Joe R. Melton & Benjamin Poulter & Jed O. Kaplan & Kees Klein Goldewijk & Stefan Siebert & Tatiana Minayeva & Gustaf Hugeli, 2023. "Extensive global wetland loss over the past three centuries," Nature, Nature, vol. 614(7947), pages 281-286, February.
    2. Sun, Chuanzhun & Zhen, Lin & Giashuddin Miah, Md, 2017. "Comparison of the ecosystem services provided by China's Poyang Lake wetland and Bangladesh's Tanguar Haor wetland," Ecosystem Services, Elsevier, vol. 26(PB), pages 411-421.
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