ABSTRACT.


Eduardo Schalscha B.1, Cecilia Nieto B.2 y Frank T. Bingham3
 

Some factors affecting phosphate fixation in allophane soils of Chile were studied. It was found that over 60% of added phosphate was fixed in the first 60 minutes. Fixation increases as the pH becomes more acid, depends on the P concentration and is described by the Freundlich isotherm. Sulfate and chloride ions do no compete wiht phosphates and, on the contrary, tend to increase P-fixation.

Keywords:
1Profesor de Química Analítica, Facultad de Ciencias Químicas, Universidad de Chile. Casilla 233, Santiago, Chile.
2Estudiantes de Licenciatura del Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas, Universidad de Chile.
3Profesor de Química de Suelos, Universidad de California, Riverside, EE. UU. de N. A.