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Updated: Jan 30, 2026

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
Published on: December 16, 2016
Microplastic content variation in water column: The observations employing a novel sampling tool in stratified Baltic
M B Zobkov1, E E Esiukova2, A Y Zyubin3
1Northern Water Problems Institute of Karelian Research Centre of the Russian Academy of Sciences, 50 A.Nevskogo prospekt Petrozavodsk, Karelia 185030, Russia.
Abstract:
A new tool was developed for microplastics (MPs) investigation in the water column. It can collect several cubic meters of water from predefined water layers down to 100 m. The tool was tested in the Baltic Sea during the period of spring thermocline formation. Strong MPs stratification was observed at all of the sampled stations. On coastal stations (~30 m deep), stratification with high fibers content was associated with the proximity of terrestrial sources and estuarine discharges, while on off-shore stations the variability of MPs was related to vertical thermohaline structure. Mean MPs content was the 32.2 (SD 50.4) pcs/m3. Elevated MPs concentrations were observed in subsurface, near-bottom and thermohaline layers compared with intermediate layers. The heterogeneity of MPs distribution suggests that MPs particles can be retained above the density-gradient layers in coastal seas and the World Ocean.
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