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Changes in the vertical distribution of acid‐soluble ferrous and total iron in filtered lake water were measured weekly for 12 months using the organic reagent bathophenanthroline. Acid‐soluble ferrous iron was present throughout all strata, the concentration fluctuating in a definite annual pattern. Values of Fe2+ changed hourly and followed a diurnal pattern. It is suggested that the concentration of Fe2+ in lake water is controlled by photochemical reactions and, perhaps, also by metabolic activity of microorganisms.
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J. W. McMahon (1969) studied this question.
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