HARPHRQ is a geochemical speciation program, developed on behalf of Nirex, that can be used to calculate: pH; Eh; quantity of minerals transferred into/out of solution as a function of reaction progress; and composition of solution in equlibrium with multiple phases solution compositions at fixed pH and/or Eh and at different temperatures.
HARPHRQ includes the HARSORB sorption module. HARSORB offers several sorption models, including: Simple Mass Action; Diffuse sorption; and Triple-layer sorption.