Modeling Solute Transport in Volcanic Ash Soils with Cation Exchange and Anion Retardation
Groundwater under agricultural lands is often contaminated by nitrate. In southern Japan, aquifers are covered by volcanic ash soils that can leach nitrate to the groundwater. In this study, column experiments using two volcanic ash soils (Kuroboku and Akahoya) were carried out. A mixed solution of KNO3 and K2SO4 was used in the leaching experiments. Based on the experiments, a reactive transport