Each chemical exists as a neutral compound and up to four ionic species. Local equilibrium is assumed so that the distribution of the chemical between each of the species and phases is defined by distribution or partition coefficients. In this fashion, the concentration of any species in any phase can be calculated from the total chemical concentration. The model then is composed of up to six systems, three chemical and three solids, for which the general WASP mass balance equation is solved. The WASP package includes both source and executable codes.
Technical support is provided.