Effect of the cationic competition on the retarding factor and dispersion-diffusion coefficient of zinc and copper in soil

• Autor(es):

  Martinez, Mauro A. (UFV);

  Ramos, Victor B.N. (UFV. DEA);

  Matos, Antonio T. de (UFV);

  Oliveira, Rubens A. de (UFV);

  Costa, Silvana N. da (PMCG. AMDE).

• Fonte:

  Revista Brasileira de Engenharia Agrícola e Ambiental; volume 5, número 2, páginas 211-215. Maio 2001.

• Assuntos:

  heavy metals;

  miscible displacement;

  pollutant dispersion.

• Resumo:

  The effects of the cationic competition on the retarding factor (fr) and the dispersion-diffusion coefficient (D) were evaluated with conducting metal mobility trials in leaching columns submitted to a saturated and steady flow. Solutions of zinc (700 mg L-1), copper (200 mg L-1) and zinc plus copper in the same concentrations, were used to obtain elution curves. Soil materials from the A, B and C horizons of Oxisol (LVa) and of Ultisol (PVc), collected in Viçosa, MG, were used. In all soil materials used, copper presented higher retarding factor values than zinc, which indicates a higher copper-soil interaction. The low velocities of the solutions resulted in low dispersion-diffusion coefficient values. Cationic competition decreased the soil retention capacity for the cations.

• Acesse o texto completo (Português)