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May 22, 2026Regional Studies in Marine ScienceOpen Access

Microplastics as stratigraphic tracers of post-1950 deposition in a reworked tropical estuary, Brazil

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Authors

PPPriscila Bassi PenteadoRRRodrigo Esteves RochaWSWANILSON LUIZ SILVA

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Overview

Randomized trial investigates microplastics distribution in a tropical estuary, highlighting their value as temporal markers.

Key Points

  • This study aims to evaluate the reliability of microplastics as chronostratigraphic markers in a disturbed estuarine environment.
  • Analyzed a sediment core (0-240 cm) from the Santos–Cubatão Estuarine System.
  • Used µ-FTIR and SEM-EDS for MP analysis alongside geochemical proxies (Hg, Cd, δ15N) and radiocarbon dating.
  • Measured MP abundance, composition, and vertical distribution, and analyzed correlations with industrial metal contaminants.
  • Mean MP abundance was 3,097 ± 451 items.kg-1, with dominance by secondary fragments and fibers.
  • The highest MP concentrations were found in the upper 35 cm, positively correlated with industrial metal contaminants (Spearman's r > 0.69).
  • Below 200 cm, MPs were absent, indicating pre-industrial conditions and supporting the identification of post-1950 deposition.

Cite This Study

Penteado et al. (2026) studied this question.

synapsesocial.com/papers/6a0ff2f5d674f7c03778b693https://doi.org/10.1016/j.rsma.2026.105065
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