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

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Environment International; (United States)

DOI:https://doi.org/10.1016/0160-4120(92)90025-Y· OSTI ID:6792867

Shaw, P J; Haan, H De ^[1]; Jones, R I ^[2]

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1. Netherlands Inst. of Ecology, Nieuwersluis (Netherlands)
2. Lancaster Univ. (United Kingdom)

The responses to pH of abiotic interactions between dissolved humic substances, iron and phosphate were investigated by examining redistributions of [sup 55]FeCl[sub 3] and [sup 32]PO[sub 4][sup 3[minus]] added to epilimnetic lakewater from Lake Skjervatjern. The simultaneous movement of [sup 55]Fe and [sup 32]P 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 [sup 55]Fe and [sup 32]P are complete after circa 24 h. Movement of [sup 32]P to particle size fractions (> 0.2 [mu]m) was not dependent on pH, whilst transformations of [sup 55]Fe to material of particle size increased as pH was lowered. Precipitation of added [sup 55]Fe and [sup 32]P was minimal at all pH values tested. Responses of precipitation losses to pH were not coincident for both radionuclides. 22 refs., 5 figs., 2 tabs.

• OSTI ID: 6792867
• Journal Information: Environment International; (United States), Vol. 18:6; ISSN 0160-4120
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ACID RAIN
ENVIRONMENTAL EFFECTS
IRON
ECOLOGICAL CONCENTRATION
IRON 55
PHOSPHATES
PHOSPHORUS 32
SURFACE WATERS
ACIDIFICATION
EXPERIMENTAL DATA
HUMIC ACIDS
MASS DISTRIBUTION
ATMOSPHERIC PRECIPITATIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
LIGHT NUCLEI
METALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RADIOISOTOPES
RAIN
SPATIAL DISTRIBUTION
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)