Figure 3. The apparatus for sediment analysis with the aid of density separation. On the left, the entire apparatus is shown before being filled with NaCl sucrose solution; on the right, the apparatus is shown after being filled and subsequent air supply. A separation of the sediment sample by circulation is assured by the rising bubbles. The upper bottle (right) is filled with the separating liquid and the muffle valve is closed in advance. Then, the air supply is employed, so that fine bubbles rise up

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