Microplastic contamination in surface water and sediments of Lake Canaçari, Central Amazon, during the dry season.
5 affiliations
- 1Universidade Federal Do Pará, Instituto de Geociências, Avenida Augusto Corrêa S/NGuamá, Belém, Pará, 66075-110, Brazil. [email protected].
- 2Universidade Federal Do Amazonas, Instituto de Ciências Exatas E Tecnologia, Rua Nossa Senhora Do Rosário, 3863, Tiradentes, Itacoatiara, Amazonas, 69103-128, Brazil. [email protected].
- 3Programa de Pós-Graduação Em Botânica, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Petrópolis, Manaus, Amazonas, 69067-375, Brazil.
- 4Departamento de Química Fundamental, Universidade de São Paulo, Instituto de Química, Av. Professor Lineu Prestes, 748-B4T, Butantã, São Paulo, São Paulo, 05508000, Brazil.
- 5Universidade Federal Do Amazonas, Instituto de Ciências Exatas E Tecnologia, Rua Nossa Senhora Do Rosário, 3863, Tiradentes, Itacoatiara, Amazonas, 69103-128, Brazil.
Abstract
Contamination by microplastics is an emerging environmental problem that is widely distributed across continental aquatic environments and may cause ecological impacts. This study evaluated the occurrence, concentration, and chemical and morphological characteristics of microplastics in surface waters and sediments from Lake Canaçari, comparing two areas with different land-use patterns within a floodplain system in the Central Amazon. Microplastics were detected in all sampled areas. In surface water, concentrations ranged from 0 (no microplastic particles detected in one sample) to 1,000 microplastics·m⁻³ (405 ± 298 microplastics·m⁻³), while in sediments, they ranged from 7 to 307 microplastics·kg⁻¹ (77 ± 104 microplastics·kg⁻¹). No significant differences in microplastic concentrations were observed between fishing and human-settlement areas. The particles were predominantly blue fibers (< 1,000 μm). Among the spectroscopically analyzed particles, polyethylene was the most frequently identified polymer, while copper phthalocyanine pigments, including Pigment Blue 15 and Pigment Green 7, were also detected by FTIR and/or Raman spectroscopy. Overall, the results suggest that Lake Canaçari may act as a transport pathway, redistribution zone, and retention compartment for microplastics; however, seasonal sampling is needed to confirm how these processes vary throughout the hydrological cycle. These results reinforce the role of Amazonian floodplain systems in the regional dynamics of microplastics and highlight the need for monitoring and management strategies that incorporate seasonal hydrological connectivity at the basin scale.
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BibTeX
@article{guimaraes2026microplastic,
title = {{Microplastic contamination in surface water and sediments of Lake Canaçari, Central Amazon, during the dry season.}},
author = {Gabriel Dos Anjos Guimarães and Rayane Vasconcelos da Fonseca and Beatriz Rocha de Moraes and Rômulo Augusto Ando and Isreele Jussara de Azevedo Rodrigues and Gustavo Frigi Perotti and Bruno Sampaio Sant'Anna and Gustavo Yomar Hattori},
journal = {Environmental monitoring and assessment},
year = {2026},
month = oct,
doi = {10.1007/s10661-026-16079-2},
url = {https://europepmc.org/article/MED/42895686},
note = {CC BY},
}
RIS
TY - JOUR
TI - Microplastic contamination in surface water and sediments of Lake Canaçari, Central Amazon, during the dry season.
AU - Gabriel Dos Anjos Guimarães
AU - Rayane Vasconcelos da Fonseca
AU - Beatriz Rocha de Moraes
AU - Rômulo Augusto Ando
AU - Isreele Jussara de Azevedo Rodrigues
AU - Gustavo Frigi Perotti
AU - Bruno Sampaio Sant'Anna
AU - Gustavo Yomar Hattori
PY - 2026
DA - 2026/10/19
JO - Environmental monitoring and assessment
DO - 10.1007/s10661-026-16079-2
UR - https://europepmc.org/article/MED/42895686
AB - Contamination by microplastics is an emerging environmental problem that is widely distributed across continental aquatic environments and may cause ecological impacts. This study evaluated the occurrence, concentration, and chemical and morphological characteristics of microplastics in surface waters and sediments from Lake Canaçari, comparing two areas with different land-use patterns within a floodplain system in the Central Amazon. Microplastics were detected in all sampled areas. In surface water, concentrations ranged from 0 (no microplastic particles detected in one sample) to 1,000 microplastics·m⁻³ (405 ± 298 microplastics·m⁻³), while in sediments, they ranged from 7 to 307 microplastics·kg⁻¹ (77 ± 104 microplastics·kg⁻¹). No significant differences in microplastic concentrations were observed between fishing and human-settlement areas. The particles were predominantly blue fibers (< 1,000 μm). Among the spectroscopically analyzed particles, polyethylene was the most frequently identified polymer, while copper phthalocyanine pigments, including Pigment Blue 15 and Pigment Green 7, were also detected by FTIR and/or Raman spectroscopy. Overall, the results suggest that Lake Canaçari may act as a transport pathway, redistribution zone, and retention compartment for microplastics; however, seasonal sampling is needed to confirm how these processes vary throughout the hydrological cycle. These results reinforce the role of Amazonian floodplain systems in the regional dynamics of microplastics and highlight the need for monitoring and management strategies that incorporate seasonal hydrological connectivity at the basin scale.
SN - 0167-6369
SN - 1573-2959
ER -