Measurement
Sampling - SOFIE® consists of a main body core, 200 mm radius, 200 mm height, which is used as a sampling device to obtain undisturbed sediment. Field samples are taken including the overlying surface water. After sampling, the core is closed at the bottom edge with a shutter plate and is mounted on a base socket. A top socket is attached, ensuring a gas-tight fitting with the body core with an internal silicone seal. The top plate of this socket has four gas tight connectors for electrodes to perform, for example, pH, Eh, EC or O2 measurements. These are inserted vertically in the sample. The sample does not leave the body core but is now part of the cell. The cell wall contains 15 gas tight connectors for probes.
For experimental scenario purposes, aerobic or anaerobic conditions in the water-sediment system may be manipulated by flushing the atmospheric head space in the cell with gas (O2, N2, CO2 or mixture) using a valve.
