Latest changes: 29 June 2009, Hans Meeussen
This page contains Orchestra examples of (published) Orchestra applications. These models run directly as applets
within your web browser (if it supports Java 1.5), but can also be downloaded to run stand-alone.
In this example, a combination of well-accepted "mechanistic" adsorption models and generic parameters is tested for its ability to simultaneously predict the leaching
of fifteen inorganic soil contaminants (Ni, Cu, Zn, Cd, Pb, Ba, Cr, Co, Mo, V, Sn, Sb, S, As and Se).
The model input consists of the total “available” concentrations in the system and parameters such as pH, dissolved and solid organic matter, iron and aluminium (hydr)oxides,
clays and concentations of (competing) background elements in the soil system. The example is used to calculate the pH-concentration diagrams (Figure 1 of Dijkstra et al.) and speciation
diagrams (supporting information) of soil no. 1. The model file forms a significant extension of that used by Dijkstra et al. 2004.
J.J.Dijkstra, J.C.L. Meeussen, R.N.J. Comans, Environmental Science and Technology 2009 (in press)
This example predicts the solid/solution partitioning of the metals Ni, Cu, Zn, Cd and Pb from their total
concentrations in the system (the "availability") and parameters such as pH, dissolved and solid organic matter, iron and aluminium
(hydr)oxides, clays and concentations of (competing) background elements in the soil system. The example is used to calculate the
pH-concentration diagrams (Figure 1 of Dijkstra et al.) and speciation diagrams (Figure 2 Dijkstra et al.) of soil no. VII.
J.J.Dijkstra, J.C.L. Meeussen, R.N.J. Comans, Environmental Science and Technology 2004, 38, 4390-4395.
This example simulates diffusion of Sr2+ ions into porous aggregates of hydrous ferric oxide (HFO), taking into account the influence of the electrostatic potential in the pores on the diffusion rate. (Donnan diffusion model)
This example calculates transport of sulphate in a goethite coated sand column at variable pH.
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.
Download the Orchestra program.(runnable .jar file, ca. 300 kb) Download the Orchestra input file.(.zip file.)
This example shows how to include adsorption in the speciation calculations. It is set up to calculate adsorption of copper Cu+2, on colloidal humic acid according to the Nica Donnan model. In the input file, the concentrations of humic acid, and background electrolyte can be given. After running, the results will be visible in the output file.
Run on line:
Download: input file(newexample1.zip ca. 7 kb)
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.
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.
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.