期刊
CHEMOSPHERE
卷 288, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132530
关键词
Microplastics; Fibers; Sediments; Ocean dynamic; Canary Islands; Fourier Transform Infrared microscopy
资金
- Consejeria de Transicion Ecologica, Lucha Contra el Cambio Climatico y Planificacion Territorial del Gobierno de Canarias
- Cabildo de La Gomera
- Turismo de Tenerife
- Autoridad Portuaria de Santa Cruz de Tenerife
- Urbaser
- Spring Hoteles
- Binter
- Fundacion La Caixa (Accion Social de CaixaBank)
- Fundacion Cepsa
- Spanish Ministry of Science, Innovation and Universities [CTM2016-74927-C2-1/2-R]
- European Regional Development Fund [2020010030]
- Thematic Network of Micro-and Nanoplastics in the Environment [RED 2018-102345-T]
The study found that sediment samples near La Palma island mainly contained microfibers, predominantly white/colorless and blue in color, with an average length of around 2423 mm and an average concentration of 2682 items per kg of dry weight, predominantly cellulose-based. While no significant differences were found in sediment depths, significant variations were observed between sampling sites on the east and west of the island.
In this work, the microplastic content of sediments collected in July 2020 between 5 and 7 m depth was studied in four locations of La Palma island (Canary Islands, Spain). At each sampling location, three samples were taken parallel to the shoreline. The microplastic content in each sampling corer was studied every 2.5 cm depth after digestion with a H2O2 solution followed by flotation in a saturated NaCl solution. Visualization of the final filtrates under a stereomicroscope revealed that all the sediment samples evaluated contained mostly microfibers (98.3%) which were mainly white/colorless (86.0%) and blue (9.8%), with an average length of 2423 +/- 2235 (SD) mm and an average concentration of 2682 + 827 items per kg of dry weight, being the total number of items found 1,019. Fourier Transform Infrared microscopy analysis of 13.9% (n = 139) of the microfibers also showed that they were mainly cellulosic (81.3%). No significant differences were found between the depths of the sediment. However, significant differences were found between the number of fibers from the sampling sites at the east and west of the island. Such variability could be driven by the winds and ocean mesoscale dynamics in the area. This study confirms the wide distribution of microfibers in sediments from an oceanic island like La Palma, providing their first report in marine sediments of the Canary Islands.
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