Studies of the physico-chemical conditions of the sediment-water interface in Lokka and Porttipahta reservoirs

• Main Authors: Hellsten, Seppo, Väisänen, Tero
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1998
• Subjects: Lokka; Porttipahta; Northern Finland
• Online Access: https://cris.vtt.fi/en/publications/4638965c-1fe8-410b-a25e-df3fc52a842a

The physico-chemical conditions of the sediment-water interface in the Lokka and Porttipahta reservoirs in Northern Finland were investigated. Oxygen concentration was measured from sedimented matter and the bottom sediment with a minielectrode measurement technique. The consumption of O 2 was calculated by Fick's first law of diffusion across the sediment-water interface. Methane samples were sub-sampled from sediment cores and analysed with a gas Chromatograph equipped with FI-detector. The oxygen and methane concentrations correlated to the redox potentials. Methane concentration was high in organic rich sediments with low redox potential values. Oxygen coasumption was higher in Lokka.