Effect of previous fertilization on phosphorus adsorption. Measurement of surface phosphorus by isotopic exchange
- Comision Nacional de Energia Atomica, Buenos Aires (Argentina)
Adsorption properties of a soil with previous additions of different phosphate fertilizers were characterized by means of the Langmuir isotherm. The best correlation with the Langmuir isotherm was obtained for low added-phosphorus concentration and for conditions of different amounts of initial soil phosphorus treatment. The phosphorus initially present in each soil sample was evaluated by isotopic exchange. (The use of different isotopic methodologies is discussed.) Carrier-free {sup 32}P was added to a soil-solution system in adsorption equilibrium after soil agitation with increasing phosphorus concentration solutions for 5 days; this allowed measurement of the adsorbed phosphorus that remained exchangeable phosphorus and equilibrium phosphorus concentration was found. The surface exchangeable phosphorus concentration at 0.3 ppm was used to estimate initial surface soil phosphorus. Taking these corrections into account, the authors found adsorption maximum and the bonding energy constant were similar in spite of the amount and kind of previous fertilizer addition. However, the behavior of superphosphate seemed to be modified in the presence of rock phosphate, especially in relation to exchange ability.
- OSTI ID:
- 5230920
- Journal Information:
- Soil Science; (United States), Journal Name: Soil Science; (United States) Vol. 150:3; ISSN SOSCA; ISSN 0038-075X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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540220* -- Environment
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ADSORPTION
ADSORPTION ISOTHERMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ECOLOGICAL CONCENTRATION
ELEMENTS
ISOTHERMS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PHOSPHORUS
PHOSPHORUS 32
PHOSPHORUS ISOTOPES
RADIOISOTOPES
SOILS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES