The effect of acidification on abiotic interactions of dissolved humic substances, iron and phosphate in epilimnetic water from the humex Lake Skjervatjern

The responses to pH of abiotic interactions between dissolved humic substances, iron and phosphate were investigated by examining redistributions of 55FeCl 3 and 32PO 4 3− added to epilimnetic lakewater from Lake Skjervatjern. The simultaneous movement of 55Fe and 32P to fractions of 10 000–20 000 a...

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Bibliographic Details
Published in:Environment international 1992, Vol.18 (6), p.577-588
Main Authors: Shaw, P.J., De Haan, H., Jones, R.I.
Format: Article
Language:English
Subjects:
ACID RAIN
ACIDIFICATION
ATMOSPHERIC PRECIPITATIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ECOLOGICAL CONCENTRATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ENVIRONMENTAL EFFECTS
ENVIRONMENTAL SCIENCES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
Freshwater
HUMIC ACIDS
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON
IRON 55
IRON ISOTOPES
ISOTOPES
LIGHT NUCLEI
MASS DISTRIBUTION
METALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS 32
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RADIOISOTOPES
RAIN
SPATIAL DISTRIBUTION
SURFACE WATERS
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES 540320 > Environment, Aquatic-- Chemicals Monitoring & Transport-- (1990-)
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Summary:The responses to pH of abiotic interactions between dissolved humic substances, iron and phosphate were investigated by examining redistributions of 55FeCl 3 and 32PO 4 3− 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 μm) 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.
ISSN:0160-4120
1873-6750
DOI:10.1016/0160-4120(92)90025-Y