Association of organic matter, iron and inorganic phosphorus in lake waters |
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Authors: | S J Eisenreich |
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Institution: | Environmental Engineering Program, Department of Civil and Mineral Engineering, University of Minnesota, Minneapolis, MN 55455, U.S.A.;Water Chemistry Program, University of Wisconsin - Madison, Madison, WI 53706, U.S.A. |
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Abstract: | Gel permeation chromatography was used to fractionate 32PO43− labelled components by molecular size in filtered, destabilized lake foam, concentrated lake water, and lake sediment extracts. Evidence is presented for the abiotic formation of organic matter iron inorganic P complexes in lake foam, water and sediments. 32PO4staggered was found to excahnge with low molecular weight, dissolved P fraction, probably an organic matter -Fe- inorganic P complex, but not with a high molecular weight, non-inorganic dissolved reactive P pool, hypothesized to be similar to the dimer. Our experiments suggest that inorganic P binding by high molecular weight organic matter may play a significant role in the P cycle. If the bound P is unavailable to algae and bacteria, the complexes could explain Rigler's (1968) hypothesis that the molybdenum blue technique may overestimate the free orthophosphate concentration by 10–100 times. |
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