ORCHESTRA Example Applets

Introduction

This page contains links to a number of Orchestra examples that run within a web browser.

1. Lesson 1

   This first example shows how to define components, species reactions. Shows how to do sweep calculations and how to get output of the speciation calculations.
   

   
   
   

2. Lesson 2

   This example shows how to define precipitation reactions (minerals) and constant pressure gases.
   

   
   
   

3. Lesson 3

   This example shows how to define adsorption reactions (Freundlich, Langmuir, Ion exchange Gaines and Thomas) .
   

   
   
   

4. Lesson 5

   This example shows how to set up a simple 1D transport system combined with Langmuir adsorption.
   

   Prepared by Wendy van Beinum
   

   
   
   

5. Cyanide Speciation

   This example calculates chemical speciation of cyanide (distribution over free cyanide and iron cyanide complexes) as a function of pH and redox potential. It includes mineral equilibria and redox chemistry.
   Calculations are continuously repeated at a range of total cyanide concentrations and visualised in a 3D graph.
   

   
   
   

   Meeussen J. C. L., Keizer, M.G., de Haan, F.A.M. (1992) The Chemical Stability and Decomposition Rate of Iron Cyanide Complexes in Soil Solutions, Environ. Sci. Technol., 26(3), 511-516.

6. Nica-Donnan

   This example calculates chemical speciation of .......
   

   
   
   

7. 1D Sulphate Transport at Variable pH in Goethite Coated Silica Sand Column

   This example calculates .
   

   Meeussen J. C. L., Kleikemper J., Scheidegger A., Borkovec M., Paterson E., van Riemsdijk W. H., and Sparks D. L. (1999) Multicomponent Transport of Sulfate in Goethite-Silica Sand System at Variable pH and Ionic Strength, Environ. Sci. Technol., 33, 3443-3450.

   
   
   

8. 1D Transport of calcium, sodium and potassium (ion exchange).

   AfterPHREEQC example nr 11
   

   
   
   

9. The examples below this line are in preparation ----------------------

10. 1D Proton Transport in Goethite Coated Silica Sand Column

    This example calculates .
    

    Scheidegger A., Bürgisser C., Borkovec M., Sticher H., Meeussen H., and van Riemsdijk W. H. (1994) Convective Transport of Acids and Bases in Porous Media, Water Resour. Res., 30, 2937-2944.

    
    
    

11. 1D Fluoride Transport at Variable pH in Goethite Coated Silica Sand Column

    This example calculates .
    

    Meeussen J. C. L., Scheidegger A., Hiemstra T., van Riemsdijk W. H., and Borkovec M. (1996) Predicting Multicomponent Adsorption and Transport of Fluoride at Variable pH in a Goethite-Silica Sand System, Environ. Sci. Technol., 30, 481-488.

    
    
    

12. 2D Ion Transport by diffusion and convection in Gel Bead Column

    This example calculates... .
    

    Van Beinum, W., Meeussen, J.C.L., Edwards, A.C., and van Riemsdijk, W.H. (2000) Modeling transport of protons and calcium ions in an alginate gel bead system: the effects of physical nonequilibrium and nonlinear competitive sorption. Environmental Science and Technology 34:4902-4907.