Figure 4. The result of the sediment analysis. On the left, the apparatus is shown after the separation. The air supply has already been removed. A suspension of micro-plastic particles and NaCl-sucrose solution are located in the upper area. The excess sediment has been collected in the lower area of the apparatus. Sediment and micro-plastics are now separated. At the top right, you can recognise some coloured microplastic particles on the suspension surface. After filtering the solution with a pleated filter, the microplastic fragments can be analysed for their origin (bottom right)

From

Student Experiments on the Topic of Micro-plastics in the Environment for Secondary Education Level II: The Coffee Pad Machine Experiment and Sediment Analysis

Sarah Vortmann, Dominique Remy, Jörg Klasmeier, Marco Beeken

World Journal of Chemical Education. 2019, 7(2), 96-101 doi:10.12691/wjce-7-2-9