LABORATORY-SCALE STUDY ON REACTIVE CONTAMINANT TRANSPORT IN SOIL BY MEANS OF ONE-DIMENSIONAL ADVECTIVE DISPERSIVE MODELS

  • Vincenzo Comegna | vincenzo.co-megna@unibas.it Department for Agro-Forestry Systems Management (DITEC), Hydraulics Division, University of Basilicata, Potenza, Italy.
  • Antonio Coppola Department for Agro-Forestry Systems Management (DITEC), Hydraulics Division, University of Basilicata, Potenza, Italy.
  • Alessandro Comegna Department for Agro-Forestry Systems Management (DITEC), Hydraulics Division, University of Basilicata, Potenza, Italy.

Abstract

We measured adsorption and transport of cadmium (Cd) in the presence of Ca2+ and Na+ salts of varying ionic strengths and pH by using batch and miscible displacement experiments, carried out on undisturbed and homogenized soil columns. A fluvent-vertic soil was used in this study. In the column experiment a clear effect of ionic strength on breakthrough curves (BTCs) of Cd2+ was observed when the Na+ concentration was increased from 0.02 to 0.2 M. The effect of increasing the Ca2+ concentration on Cd2+ absorption and transport was relatively less pronounced than that recorded for the Na+ solution. At low pH values, H+ ions competed strongly with Cd2+ ions and, at a high pH, precipitation was the main process taking place for Cd2+ sorption. The reliability of the advection- dispersion equation (ADE) was tested. When implemented within the least-squares method, the model produced a sufficiently precise space-time distribution of Cd2+ ion concentrations. The results of this study demonstrated also, that laboratory leaching experiments, when performed on homogenized soil columns, can greatly underestimate Cd2+ ions transport in the field and that preferential flow can increase the mobility and velocity of cadmium movement to the groundwater.

Dimensions

Altmetric

PlumX Metrics

Downloads

Download data is not yet available.
Published
2012-06-22
Info
Issue
Section
Original Articles
Keywords:
sorption, ionic strength, pH, miscible displacement, Cd2 mobility.
Statistics
  • Abstract views: 649

  • PDF: 379
How to Cite
Comegna, V., Coppola, A., & Comegna, A. (2012). LABORATORY-SCALE STUDY ON REACTIVE CONTAMINANT TRANSPORT IN SOIL BY MEANS OF ONE-DIMENSIONAL ADVECTIVE DISPERSIVE MODELS. Journal of Agricultural Engineering, 42(3), 1-6. https://doi.org/10.4081/jae.2011.3.1