The effects of redox on Mo, U, B, V, and As solubility in evaporation pond soils
Journal Article
·
· Soil Science; (United States)
- Univ. of California, Riverside (United States)
Soils and irrigation drainwaters from the west side of the San Joaquin Valley, California have elevated levels of Mo, U, B, V, As, and Se. Much of the drainwater is disposed of in evaporation ponds that may be periodically dried, resulting in cyclic changes in the redox status of the pond sediments. A laboratory incubation study was conducted to evaluate the effects of redox status on the solubility of trace elements in saline sediments and soils from the San Joaquin valley. The elements U and Mo were mobilized under oxidizing conditions, while Fe, Mn, Ni, V, and As were more soluble under reducing conditions. Reduction and precipitation of Mo, apparently as MoS[sub 2], was observed from 1 to 10 days after flooding, but when reaerated the Mo resolubilized in less than 1 day. The reductive dissolution of Fe- and Mn-oxyhydroxides released adsorbed B, which resulted in an increased solution concentration of B. Low redox conditions in drainwater ponds may reduce the solution concentrations of U, Mo, and Se, thereby reducing their chances of entering the food chain through algae uptake. However, low redox conditions favor the solubilization of As and V, which may pose an alternative threat to wildlife visiting the ponds. 16 refs., 7 figs., 1 tab.
- OSTI ID:
- 6337778
- Journal Information:
- Soil Science; (United States), Journal Name: Soil Science; (United States) Vol. 155:4; ISSN SOSCAK; ISSN 0038-075X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACTINIDES
ARSENIC
BORON
CALIFORNIA
CHEMICAL REACTIONS
DEVELOPED COUNTRIES
DISSOLUTION
ELEMENTS
EVAPORATION
FOOD CHAINS
IRON
IRRIGATION
METALS
MOLYBDENUM
NORTH AMERICA
OXIDATION
PHASE TRANSFORMATIONS
PONDS
REDOX REACTIONS
REDUCTION
SEDIMENTS
SELENIUM
SEMIMETALS
SOILS
SOLUBILITY
SURFACE WATERS
TRACE AMOUNTS
TRANSITION ELEMENTS
URANIUM
USA
VANADIUM
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACTINIDES
ARSENIC
BORON
CALIFORNIA
CHEMICAL REACTIONS
DEVELOPED COUNTRIES
DISSOLUTION
ELEMENTS
EVAPORATION
FOOD CHAINS
IRON
IRRIGATION
METALS
MOLYBDENUM
NORTH AMERICA
OXIDATION
PHASE TRANSFORMATIONS
PONDS
REDOX REACTIONS
REDUCTION
SEDIMENTS
SELENIUM
SEMIMETALS
SOILS
SOLUBILITY
SURFACE WATERS
TRACE AMOUNTS
TRANSITION ELEMENTS
URANIUM
USA
VANADIUM