Cedre has 6 of these cells, each 3 x 3 m and made of a frame fitted with floats at each of the 4 corners. A flexible tarpaulin attached to the frame hangs down 2 metres into the water and is open at the base. The tarpaulins act as a curtain and do not affect the waves causing agitation at the water surface. The conditions inside and outside the cells are therefore practically identical: waves, temperature, wind, dilution…
This system is used to study the fate of a substance through replication to statistically validate the results (6 floating cells).
This system is used for many studies:
- monitoring the fate and weathering of, mainly floating, oil or chemicals. The tests are conducted on 10 to 50 litres of pollutant and generally last a week.
- assessment of the efficiency of dispersants according to the degree of weathering of the pollutant or the application mode, e.g. one or two applications, association of a dispersant and demulsifier.
- assessment of the efficiency of demulsifiers, sorbents or flow agents.
Complementary to substances physico-chemistry studies, ecotoxicity tests can be realized by immersing in the floating cells, cages with marine organisms.