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Photoreduction of iron in the epilimnion of acidic lakes
Author(s) -
Collienne R. H.
Publication year - 1983
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1983.28.1.0083
Subject(s) - epilimnion , ferrous , ferric iron , chemistry , environmental chemistry , ferric , redox , particulates , organic matter , humic acid , solubilization , ferrihydrite , inorganic chemistry , eutrophication , organic chemistry , nutrient , hypolimnion , biochemistry , fertilizer , adsorption
Two acid soft‐water lakes in the east of Belgium contain appreciable amounts of soluble ferrous iron in the epilimnetic zone which change diurnally and annually. A considerable drop in redox potential in the same zone confirms the existence of an active reduction of ferric iron, with a concomitant solubilization of particulate iron and of deposited iron supplied from the sediments in contact with epilimnetic water when the latter is well oxygenated. The reduction process is essentially photochemical, promoted by optimal pH conditions and by the presence of organic matter (humic acids).