The CHESS model for calculating chemical equilibria in soils and solutions

Robert C. Santore, Charles T. Driscoll

Research output: Chapter in Book/Entry/PoemChapter

6 Scopus citations


This chapter describes a model for chemical equilibria in soils and solutions (the CHESS model) that can be used to assess reaction formulation in environmental chemistry research. The approach used in the CHESS model is similar to models such as MINEQL that are based on the tableau notation for describing chemical systems. A thermodynamic approach for modeling reactions between dissolved solutes and soil surfaces can be patterned after the approach used for solute-solute interactions. An equilibrium model capable of simulating soil surface reactions using a variety of formulations, and in a variety of experimental systems, can provide information necessary for evaluating the applicability of various equilibrium approaches. The CHESS model was designed to allow the user to evaluate alternative formulations for sorption reactions. Some of the formulations which have been used with the CHESS model are discussed for reactions involving sulfate adsorption and cation exchange.

Original languageEnglish (US)
Title of host publicationChemical Equilibrium and Reaction Models
Number of pages19
ISBN (Electronic)9780891189374
ISBN (Print)9780891188179
StatePublished - Oct 26 2015


  • CHESS model
  • Cation exchange
  • Chemical equilibria calculation
  • Dissolved solutes
  • Environmental chemistry research
  • Soil surface reaction simulation
  • Soil surfaces
  • Solute-solute interactions
  • Sulfate adsorption
  • Thermodynamic approach

ASJC Scopus subject areas

  • General Engineering
  • General Agricultural and Biological Sciences


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