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<p>This study investigates the abundance, morphology, polymer composition, and carbon isotopic signatures (δ<sup>13</sup>C) of microplastics (MPs), and sedimentation rate via <sup>210</sup>Pb dating in sediment cores from the Lach Tray estuary, northern Vietnam. MPs were extracted using NaCl density separation and identified with a Zeiss stereomicroscope and micro-Fourier Transform Infrared Spectroscopy (µ-FTIR). Fragments and fibers dominated, with white/transparent 76.4% and blue 7.6% colors prevailing. Polyethylene 47% and polypropylene 43% were the most abundant polymers. MPs concentrations increased from 440 ± 29 to 1880 ± 68 MPs/kg (2012–2023), corresponding to sedimentation rates of 3.49–5.21&#xa0;cm·yr⁻<sup>1</sup>. δ<sup>13</sup>C variations between polymers indicate temporal shifts in MPs sources. The combined use of isotopic and sediment dating methods provides valuable insights into the history of plastic pollution in estuarine environments.</p>

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Ten-year trends in microplastic deposition in sediments at the Lach Tray estuary, Hai Phong province, Vietnam

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Ha Lan Anh,
  • Nguyen Manh Thang,
  • Vu Thi Hien,
  • Duong Duc Thang,
  • Mai Dinh Kien,
  • Le Dinh Cuong,
  • Vo Thi Anh,
  • Duong Hong Anh

摘要

This study investigates the abundance, morphology, polymer composition, and carbon isotopic signatures (δ13C) of microplastics (MPs), and sedimentation rate via 210Pb dating in sediment cores from the Lach Tray estuary, northern Vietnam. MPs were extracted using NaCl density separation and identified with a Zeiss stereomicroscope and micro-Fourier Transform Infrared Spectroscopy (µ-FTIR). Fragments and fibers dominated, with white/transparent 76.4% and blue 7.6% colors prevailing. Polyethylene 47% and polypropylene 43% were the most abundant polymers. MPs concentrations increased from 440 ± 29 to 1880 ± 68 MPs/kg (2012–2023), corresponding to sedimentation rates of 3.49–5.21 cm·yr⁻1. δ13C variations between polymers indicate temporal shifts in MPs sources. The combined use of isotopic and sediment dating methods provides valuable insights into the history of plastic pollution in estuarine environments.