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.
The name CHEAQS was partly inspired by Lowell George's song Cheek To Cheek, which you can find everywhere on the internet, e.g. here.
The PowerBasic and especially Firefly communities are thanked for their excellent support, most notably by their forums.
CHEAQS was written by Wilko Verweij (1961). He studied
inorganic chemistry at Groningen University where he did a master
thesis on speciation of arsenic (1986). From 1986 until 1991, he
did his Ph.D. research at the Limnological Institute (subject:
speciation of copper in lakes with high content of organic
matter). You can still find this thesis here
(long download time). For this thesis, Wilko developed his first
speciation program called GECHEQ.
Since 1991, he works at the National Institute for Public Health and the Environment (but CHEAQS is NOT a product of this institute). In his own time, he continued developing chemical equilibrium models, with special attention for the user friendliness and chemical intuition.
Main focus of his current work is the implementation of the
European Water Framework Directive, both at national and
international level. Wilko visited Bulgaria, Croatia, Macedonia,
Romania, Serbia,Turkey and Tunisia to assist those countries in
implementing the Water Framework Directive. See e.g. Twinning Project (2007-2009) or Twinning
Project on Surface Water Quality Monitoring (2011-2014).