Modeling of Salt Sorption in Volcanic Ash Soil

Kei Nakagawa, Shin Ichiro Wada, Ryoma Kitamura, Ronny Berndtsson

Research output: Contribution to journalArticlepeer-review


Groundwater pollution by nitrate from agricultural fields is a worldwide problem. To improve the understanding of nitrate transport processes through volcanic ash soils overlying groundwater aquifers, salt sorption experiments were performed. Salt sorption is the process that involves the simultaneous use of cation and anion adsorption mechanisms without changing the pH. Prepared six different concentrations of potassium chloride (KCl) solutions were mixed with soil samples. Anion and cation contents of the liquid and solid phases were determined. Experiments were performed in triplicate of six kinds of KCl solutions for three types of soils. Thus, total 54 of samples were analyzed. Relationships between ionic strength and sorption capacity increments of cations and anions were determined. The results show that if ionic strength of the infiltrating solution to the volcanic ash soil is known, the ECEC (effective cation exchange capacity) and EAEC (effective anion exchange capacity) can be reliably estimated. The resulting prediction equations can be included to improve reactive transport simulation models. Consequently, it will be possible to better understand solute transport with changing sorption capacity for the solid soil phase.

Original languageEnglish
Pages (from-to)2594-2600
Number of pages7
JournalCommunications in Soil Science and Plant Analysis
Issue number21
Publication statusPublished - 2017 Nov 30

Subject classification (UKÄ)

  • Oceanography, Hydrology, Water Resources
  • Geochemistry


  • Andisol
  • anion exchange
  • cation exchange
  • electrical conductivity
  • ionic strength
  • salt sorption


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