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UV‐sensitive complex phosphorus: Association with dissolved humic material and iron in a bog lake 1
Author(s) -
Francko David A.,
Heath Robert T.
Publication year - 1982
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.1982.27.3.0564
Subject(s) - ferrous , ferric , chemistry , humic acid , bog , phosphorus , environmental chemistry , inorganic chemistry , ferric iron , dissolved organic carbon , peat , organic chemistry , ecology , fertilizer , biology
The concentration of UV‐sensitive complex phosphorus compounds in water from an acid bog lake was linearly related to the concentration of dissolved high molecular weight humic material (DHM) both seasonally and diurnally. The first‐order rate of photoreduction (F 3+ to Fe 2+ ) of DHM ·· iron equaled the rate of release of orthophosphate (SRP) from these compounds. The rate of photoreduction of DHM ·· iron was the same as the rate of photoreduction of ferric citrate under similar conditions. Reduced DHM ·· iron was auto‐oxidizable (Fe 2+ to Fe 3+ ); ferrous citrate was not. These data support the view that orthophosphate sorbed to ferric iron ·· DHM complexes may be released by a mechanism involving UV‐induced photoreduction of ferric iron to the ferrous state.