Current version

CHEAQS Next is the next generation of the speciation program CHEAQS Pro. The current version of CHEAQS Next is 2019.3, dated 24 September 2019.

Next release

The current plan is to stop development of the current 32-bit version and to focus entirely on a new version which will only run on 64-bit systems. A first version (still very incomplete) is available for 'sneak preview'.

Version History

2019.3 (24 September 2019)

This version has five more amino acids added to the database so ten in total.

2019.2 (9 July 2019)

This version has five amino acids added to the database. In addition, a bug was fixed that caused adsorption to be skipped when organic complexation was also included.

2019.1 (27 February 2019)

This version has DTPA added to the database. In addition, some small bugs were fixed.

2018.1 (24 October 2018)

This version has citrate added to the database. In addition, some errors in the database as well as some small bugs were fixed.

2017.3 (7 July 2017)

A fourth model for organic complexation was added, the one developed by Cabaniss & Shuman (1988). Furthermore, equilibrium definitions for gas-solution-equilibria can be displayed. Also, a utility was added to delete user files in case the program is uninstalled.

2017.2 (14 March 2017)

Two more titration types were added, including a real chemical titration with volume change. Also, titration graphs can be shown in log-mode.

2017.1 (7 January 2017)

A third titration type is added.

2016.3 (17 September 2016)

2016.2 (11 June 2016)

Pie graphs added as output option, log-values show during output and some bug fixes.

2016.1 (13 January 2016)

Main new feature is the option to add items to the database interactively.

2015.3 (23 August 2015)

You can manipulate the database by removing or changing cations, ligands and species in an entirely new, easy-to-use interface (adding items to the database is foreseen for the near future).

In addition, CHEAQS Next remembers recent input and output files (if you like).

Convergence for high ionic strength samples was improved.

2015.2 (24 June 2015)

2015.1 (1 January 2015)

2014.0.9.4 (5 May 2014)

2014.0.9.3 (4 April 2014)

A bug causing a fresh installed program to hang was corrected. Sorry for inconvenience.

2014.0.9.2 (30 March 2014)

2014.0.9 (19 January 2014)

Some features that are included in CHEAQS Pro are not yet implemented in CHEAQS Next, such as calibrations.


September 24, 2019: new version of database uploaded containing five more amino acids.

July 9, 2019: new version of database uploaded containing DTPA. citrate and five amino acids.

July 7, 2017: new version of program and manual updated.

June 11, 2017: list of references updated.

March 14, 2017: program updated as well as the manual.

March 1, 2016: the manual is updated to reflect latest version 2016.1.

January 13, 2016: program version 2016.1 is available.

October 9, 2015: the updated manual is available! All recently added features are described in this version.

September 19, 2015: updated manual is expected soon.

August 23, 2015: program version 2015.3 is available.

June 24, 2015: program version 2015.2 is available.

January 23, 2015: a chapter has been added to the manual with chemical background information.

January 1, 2015: the first full-grown version of CHEAQS Next was released. Beta-testing resulted in several changes.

October 16, 2014: a new chapter was added to the manual, containing four 'ín-depth'-topics:

May 21, 2014: chapters 1 and 2 of the manual are finished (introduction and discussion of menu commands).

May 5, 2014: a fourth release is now available. All known issues are now resolved.

March 30, 2014: a second release is now available. Printing the output is now included and a different way of automatically keeping the program up to date.

January 19, 2014: the first release was prepared and uploaded.

January 2, 2014: more pages were uploaded.

December 24, 2013: the templates for the website were completed and the first page was filled.

December 6, 2013: the domain name was registered. This is the start of a cheaqs-site which is no longer part of the telfort site.