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The determination of microplastic contamination in freshwater environments using sampling methods : A case study

Karaban Kamil, Poniatowska Agnieszka, Kaliszewicz Anita, Winczek Michał, Ilieva-Makulec Krassimira, Romanowski Jerzy

Journal of Water and Land Development

2023

no. 57

140--146

We compared different net sampling methods for microplastic quantitative collection by sampling different water volumes with nets of different mesh sizes. Sampling covered freshwater lake and reservoir with a significant degree of eutrophication located in Central Poland. The fibres were the main type of plastic collected from sampling sites and constituted 83% of all microplastic particles. Fibres of 700-1900 μm dominated in the samples. The size of mesh affected the amount of fibres collected. Small fibres of 10-200 μm in length were collected using only a fine net of 20 μm mesh size. The total amount of fibres depended on sample volumes; concentrations of microplastics were higher for smaller water volumes. It is likely that clogging with phytoplankton and suspended particles reduced the filtration capacity of the finest nets when large volumes were sampled, which led to an underestimation of microplastic. To our knowledge, this is the first study to provide evidence that the amount of small microfibres depends on mesh size and that the total microplastic abundance in freshwaters in Poland depends on the sample volume. We suggest sampling rather larger than smaller water volumes to assess the level of microplastic contamination more accurately, but clogging, which reduces the filtration capacity of finest nets, should be taken into account when eutrophic freshwater environments are studied.

Mikroplastik i mezoplastik w wybranych wodach płynących na obszarze aglomeracji krakowskiej

Dacewicz Ewa, Bergel Tomasz, Łobos-Moysa Ewa, Moraczewska-Majkut Katarzyna, Nocoń Witold K.

Instal

2022

nr 9

43--47

W pracy dokonano oceny występowania cząstek plastiku w zastoiskach Wisły, przepływającej przez aglomerację krakowską. W pobranych próbkach wód określono obecność plastikowych zanieczyszczeń z uwzględnieniem ich pochodzenia, wielkości, koloru i kształtu. We wszystkich badanych zastoiskach stwierdzono obecność zarówno pierwotnych, jak i wtórnych cząstek tworzyw sztucznych. Na podstawie wielkości drobin plastiku wyróżniono dwie główne jego grupy: mikroplastik i mezoplastik. Ze względu na kolor drobin wyróżniono sześć głównych grup: biały, czarny, czerwony, niebieski, szary i inny. Pod kątem kształtu, cząstki tworzyw sztucznych zakwalifikowano do pięciu grup tj. folia, granulki, płatki, skrawki i włókna.

In the article, the assessment of the occurrence of plastic particles in the reservoirs of the Vistula River flowing through the Krakow agglomeration was made. In the collected water samples, the presence of plastic particles according to their origin, size, color and shape was determined. The presence of plastic particles in all the tested stagnations was found. Based on the size, two main groups were distinguished, i.e. microplastic and mesoplastic. Due to the color of the particles, six main groups of plastic are distinguished: white, black, red, blue, gray and others. In terms of shape, the plastic particles are classified into five groups, i.e. foil, granules, flakes, scraps and fibers.