Abstract
The amount of ferric iron in true solution in sea water has been found to be very small (Cooper 1935). In the course of an investigation on the iron supply of diatoms, H. W. Harvey observed that ferric hydroxide, even in alkaline solution, continuously gave off ferrous ions which reacted with 2 : 2'-dipyridyl to give the red tris-dipyridyl-ferrous ion. This led to the inquiry—how much iron can exist' in true solution in sea water after equilibrium has been attained, and what are the conditions governing the equilibrium between ferrous and ferric ions?. With this end in view the theoretical calculations of 1935 have been extended and supplemented by a study of the oxidation-reduction potential of sea water (Cooper 1937). It was realized that such information would apply to the absorption of iron from alkaline solutions by other organisms.
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