CHEAQS Next is a computer program for calculating CHemical Equilibria in AQuatic Systems. You supply input data, the program calculates the chemical speciation for you. CHEAQS Next is free but it is not cheap.
CHEAQS Next is the next generation of speciation programs written by Wilko Verweij. The first member of this family was GECHEQ, developed between 1986 and 1996. The first edition of CHEAQS (the light version) was developed between 1998 and 2004, the Pro version between 2004 and 2013. This version is still available for download here. The first beta-release of CHEAQS Next became available early 2014, the first full-grown version in January 2015.
Features:
- You can calculate the concentration of complexes, but you can also calculate:
- redox equilibria;
- complexation by natural organic matter (3 different models developed by Tipping and co-workers: Model V, Model VI and Model VII;
- solids that are formed due to oversaturation (or just calculate if they are oversaturated or not);
- adsorption (surface complexation model).
- pH: you can either specify a fixed pH or have the program calculate the pH for you.
- Input: you can edit input interactively (screenshot) or read from an input file.
- Output: You can view output on your screen (screenshot), save in an output file, or export to an .CSV or .XML file (both types can be read by spreadsheet programs like EXCEL 2002 and later).