Chemistry and phytotoxicity of arsenic in soils. II. Effects of time and phosphorus
Arsenate from sodium arsenate changes to less soluble compounds in soils with time. To study these changes, the arsenic soluble in 1N NH/sub 4/Cl, 0.5N NH/sub 4/F, 0.1N NaOH, and 0.5N H/sub 2/SO/sub 4/ solutions was determined. These dissolved arsenates, were designated as WS-As (water soluble, Al-As, Fe-As, or Ca-As, respectively. The percent of WS-As present was proportional to As added and inversely proportional to time, and to the Fe and Al content. Fe-As was the predominant form of As in Hagerstown silty clay loam while Al-As predominated in Lakeland loamy sand. Growth of corn (Zea mays) increased with increase in time of As incubation in the soil before planting. Arsenic phytotoxicity and As in the plant were altered by P additions. Arsenic residues in the Lakeland soil became more phytotoxic, while residues in the Hagerstown soil became less phytotoxic with P additions. This plant response was related to the availability of As and P in these soils. Leaching with 0.05 M KH/sub 2/PO/sub 4/ removed 77% of the total As from a contaminated Dunkirk fine sand. The distribution of the forms of As in this soil changed during leaching. 26 references, 3 figures, 4 tables.
- Research Organization:
- Dept. of Agriculture, Beltsville, MD
- OSTI ID:
- 5129238
- Journal Information:
- Soil Sci. Soc. Am., Proc.; (United States), Journal Name: Soil Sci. Soc. Am., Proc.; (United States) Vol. 37:2; ISSN SSSAA
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALUMINIUM
ARSENIC
BIOLOGICAL AVAILABILITY
BIOLOGICAL EFFECTS
CEREALS
CHEMISTRY
DATA
DISSOLUTION
ELEMENTS
EXPERIMENTAL DATA
GRASS
GROWTH
INFORMATION
IRON
LEACHING
MAIZE
METALS
NONMETALS
NUMERICAL DATA
PHOSPHORUS
PLANT GROWTH
PLANTS
RESIDUES
RESPONSE MODIFYING FACTORS
SEMIMETALS
SEPARATION PROCESSES
SOIL CHEMISTRY
SOILS
SOLVENT PROPERTIES
TOXICITY
TRANSITION ELEMENTS