REACTIVE TRANSPORT CHARACTERISTICS FOCUSSING ON SALT SORPTION ON VOLCANIC ASH SOIL

Abstract

 Due to that volcanic ash soils are distributed all over Japan, chemical evolution processes of water in these soils is important for evaluating groundwater pollution caused by agricultural activities. In this study, three kinds of volcanic ash soils were used for column experiments with leaching of KCl solution. As a result, we characterized reactive transport characteristics in volcanic ash soils. Relationship between ionic strength of soil solution and ion exchange capacities was determined. We also confirmed that selective coefficients of potassium and calcium depend on the ionic strength of soil water.