Shaw, P.J., De Haan, H. and Jones, R.I.
The effect of acidification on abiotic interactions of dissolved humic substances, iron and phosphate in epilimnetic lake water from the humex Lake Skjervatjern
Environment International, 18, (6), . (doi:10.1016/0160-4120(92)90025-Y).
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The responses to pH of abiotic interactions between dissolved humic substances, iron and phosphate were investigated by examining redistributions of 55FeCl3 and 32PO43? added to epilimnetic lakewater from Lake Skjervatjern. The simultaneous movement of 55Fe and 32P to fractions of 10 000–20 000 and > 100 000 Daltons nominal molecular weight, as indicated by Sephadex gel filtration, diminished in response to decreasing pH. Variations in transformations to larger molecular size fractions with incubation time revealed by gel filtration were erratic, but indicated that transformations of added 55Fe and 32P are complete after circa 24 h. Movement of 32P to particle size fractions (>0.2 ?m) was not dependent on pH, whilst transformations of 55Fe to material of particle size increased as pH was lowered. Precipitation of added 55Fe and 32P was minimal at all pH values tested. Responses of precipitation losses to pH were not coincident for both radionuclides.
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