The production of organic matter in sea water by the phytoplankton community has frequently been computed (Nielsen, 1937; Riley 1941) by measuring the oxygen evolution in bottled sea water samples and calculating the organic matter on the assumption that the phytoplankton organisms produced glucose by photosynthesis according to the equation:...
Sargent, Marston C., and James C. Hindman. 1943. "The ratio of carbon dioxide consumption to oxygen evolution in sea water in the light." Journal of Marine Research 5, (2). https://elischolar.library.yale.edu/journal_of_marine_research/609