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Visual MINTEQ version
history
ver. 2.60. First released 3/1 2009, last version from 6/1
2009. The code for surface complexation and organic complexation reactions
has been completely rewritten. The thermodynamic databases have a new file
extension (*.vdb) and some of them have been renamed and/or restructured.
When using the multi-problem/sweep options, there is no longer an upper
limit for the number of problems that can be handled.
ver. 2.53. First released 24/10 2007. This version corrects a
number of issues in Visual MINTEQ ver. 2.52, for example: (i) a number of
small errors in the Biotic Ligand Model were detected (errors in some
parameter files, and in the numerical routines for the "Toxicity"
mode) and then corrected, (ii) Use of the SHM and NICA-Donnan models
sometimes caused Error 75, this should now be corrected, (iii) The option
to fix total dissolved concentrations caused erroneous results when
possible solids precipitated, this error is now corrected.
ver. 2.52. First released 7/5 2007. This version does not
contain any new functionality, but it corrects various errors in earlier
versions. The most significant of these are: (i) A small error in the
NICA-Donnan model was detected and fixed (missing activity correction for
hydrogen ions). At low ionic strength (< 0.01 M) this error generally
affected the results for individual concentrations by less than 10 %,
however at higher ionic strengths and at high pH the error could be more
significant. (ii) Due to a missing text string in the code, output results
could not be read in versions 2.40, 2.50, and 2.51 when the Constant
Capacitance model was used. (iii) Under certain conditions the program
sometimes produced "false" convergence and therefore incorrect results
after 4800 iterations. (iv) The numeral optimization routine has been
changed; this should generally lead to safer convergence for the organic
complexation models (SHM and NICA-Donnan).
ver.
2.51. First released 21/12
2006. This version corrects a large number of minor issues in version
2.50. The default installation folder is now C:\(Program Files)\vminteq
instead of C:\vminteq). In addition, this version contains a fully
functional Biotic Ligand Model.
ver. 2.50. First released 22/5 2006 (exists only in a .NET
version), last revised 31/5 2006. This version introduces a number of new
features, such as the possibility to fix total dissolved concentrations of
components in adsorption problems, and the use of SIT (specific ion
interaction theory) for activity corrections. See the help file
"vminhelp.htm" for a summary of these changes. A number of bugs has also been corrected. For those
who experience difficulties with the .NET version, version 2.40b remains
available for download. Note! If you downloaded version 2.50
from this site before 1 June please download this zip
file, which (i) corrects an error in the way MINTEQ deals with total
dissolved concentrations in the output, and (ii) corrects an error in the
sweep output for certain species. Extract the "mintrun.exe" file
from the zip file and replace the old file with the same name in your
Vminteq folder.
ver. 2.40. First released 9/1 2006, last revised 23/1 2006.
This version introduces a completely new version of the calculation engine
Mintrun.exe, which has now been rewritten in VB.NET. In addition a large
number of small corrections and additions has been made. For example, it is
now possible to delete entries one by one from the sweep output list on the
multi-problem/sweep menu. From the 21/1: the version now
exists in two varieties, one, version 2.40b, which requires .NET framework
installed and one which doesn't. The original version from 9/1, which
requires .NET framework 1.1 or higher (can be downloaded from Microsoft), created
errors for some users when trying to make calculations (either a
'File not found' error or a failure to run the program at all). In
addition, a minor issue, that also led to a "File not found"
error on some machines, is also now corrected.
ver. 2.32. Released 7/4 2005, last edition from 21/4 2005.
This version makes it easier to use surface complexation models with
predefined parameter sets (for the Diffuse Layer Model with HFO and HMO,
the user only needs to specify the suspension concentration). It is now
also possible to use the NICA-Donnan model for simulation of metal binding
to solid-phase humic and fulvic acid. The alkalinity has been redefined,
and alkalinity factors according to Dickson (1981) have been included in
the program. The edition of the 11/4 2005 contains a few minor
corrections (see text
file here). If you already have ver. 2.32 installed, you do not have to
reinstall: click
here to download a zip file with the updated file.
ver. 2.31. Released 19/1 2005, last updated 25/1 2005. This
version does not add any new functionality compared to version 2.30, but it
corrects a number of issues with ver. 2.30, such as: (i) Some errors in the
NICA-Donnan model was found; only one of these was serious, and this
concerned the way the model dealt with the organic complexes of Hg(II) and
Cr(III). Therefore, if you used version 2.30 for NICA-Donnan calculations
with Hg(II) and Cr(III), you are advised to download this update and to
correct your earlier calculations. (ii) In the output, version 2.30 showed
the results for the partial pressure of only one gas, also in cases when
more gases were present. This has now been corrected. Minor update
25/1 2005: If you downloaded Visual MINTEQ ver. 2.31 prior to this
date you can download a zip file with the most recent changes from
here. Please see the file readme.txt for details.
ver. 2.30. Released 2/6 2004, last revised 4/6 2004. This is a
major new update, which has added new functionality for calculations
involving adsorption and metal-humic complexation. To model adsorption
reactions, the user can now use a range of different adsorption isotherm
reactions (Linear Kd, Freundlich, Extended Freundlich, Langmuir, Temkin, Langmuir-Freundlich
and NICA). The NICA-Donnan model for metal-humic complexation has been
included, which means that there are now three different humic submodels to
choose from (Gaussian DOM, SHM and NICA-Donnan). Furthermore, it is now
easier to use the SHM and NICA-Donnan models in speciation problems; the
user can supply a value of DOC (dissolved organic carbon), and then MINTEQ
includes "generic" parameters and constants automatically.
Furthermore, this version includes corrections of a few bugs in, e.g., the
Sweep function.
ver. 2.23. Released 16/2 2004. This version corrects some
small errors in the code for SHM (Stockholm Humic Model); (i) activity
corrections for dissolved FA and HA were not made in a consistent way, and
(ii) when both dissolved FA and dissolved HA were present, some HA species
did not appear in the species list. Fortunately, it appears that these bugs
affected previous SHM calculations only to a very small, often
insignificant, extent! In addition, an error was detected for the SHM
import option, which sometimes caused the program to try to read an Excel
file from the wrong folder (which of course resulted in an error message).
This should not happen now, I hope.
ver. 2.22. Released 24/11 2003, last edition from 4/12 2003.
This version contains two new databases for cation sorption to hydrous
manganese oxide and sorption to
goethite. Moreover a few updates have
been made to improve the functionality as regards multi-problem files and
pH calculations from mass and charge balance when infinite solids are
present. Click
here to download a zip file with the latest revisions - unzip the files
and place them in your VMINTEQ folder. The
most recent edition (i) corrects a bug that may have caused erroneous
results when applying the TPM surface complexation model when two coordination sites had different
charges for the reference oxide components, and (ii) contains database
updates; some species that were removed prior to ver. 2.20 have now been
included again, see
this document.
ver. 2.21. Released 30/9 2003, last edition from 5/11 2003.
This version corrects an error in the sorption database editor, which
stopped the user from making changes. The thermodynamic database also
include new estimates of jarosite and ettringite solubility. One user has
reviewed the thermodynamic databases and found a number of errors, which
are now corrected. Link
to report of these corrections. (pdf). The edition of the 5/11 2003
contains a few minor corrections to the databases; the As2O5
constant (see report above) and modified surface complexation constants for
molybdate and tungstate for use with
the Diffuse Layer Model. If you
already have ver. 2.20 or 2.21 installed, you do not have to reinstall: click
here to download a zip file with the updated files. Extract all these
files to your VMINTEQ folder and replace the old files.
ver 2.20. Released 5/9 2003. This version contains:
updated databases for inorganic complexes and precipitates (NIST 46 ver
7.0), modified help files describing e.g. the suspension option of SHM,
improved functionality of the Excel import option (it is now possible to
import temperatures, ionic strengths and fixed log activities of component
species), and fixes to some bugs that accidentally arose in the latter
Visual MINTEQ versions. Examples of fixes: the temperature power functions
now work as intended, MINTEQ can now be installed on other drives than C (I
hope, please report to me if this is problematic), and solid-phase humics
are not subject to activity correction. In addition, the counter-ion
accumulation option in ver. 2.15a did not always work, but it should work
now.
ver 2.15a. Released 15/6 2003. This is not really a new version. The only difference to ver. 2.15
is that the "Suspension" option for SHM is now enabled. A real
new version, which includes updates to the databases and to the help file
system, can be expected in September 2003.
ver 2.15. Released 6/3 2003. Similar in functionality to ver. 2.14, except that now for Sweep /
Multi problems up to thirteen components / species can be printed on a
separate output table. A bug in the SHM code was detected, which affects
the log K of bidentate species with approx. 0.2 log K units. Corrections
have been made in the databases "pphacon.mdb" and
"shmgeneric.mdb" to reflect this. This ensures that SHM results
obtained with previous model versions are very similar to the ones obtained
with ver. 2.15. Another error was corrected, which caused a program crash
in certain problems with many precipitating and dissolving solids.
ver 2.14. Released 27/1 2003. A major new update,
which addressed many of the issues brought up by users. The two most
significant changes are (i) columns of data can now be imported from an
Excel sheet via the Multi-problem generator, (ii) the revision of the
database has been completed; it now contains > 3,000 aquoeus species and
> 600 solids. In addition, it is now possible to limit the information
shown on the Output tables. Many bugs and other insatisfying aspects of the
program have been removed; most significantly I have AT LAST managed to
improve the Excel export so that the user does not need to worry about
getting Error 1004.
ver. 2.13a. Released 14/12 2002. Corrects an error in
ver. 2.13 which appeared when including a fixed CO2 pressure in
the calculations.
ver. 2.13. Released 13/12 2002. The thermodynamic
database has now been revised, using the most recent NIST critical
stability constants. A number of bugs were also fixed, i.e. one that caused
a program crash when the execution was halted due to too many iterations.
ver. 2.12. Released 15/8 2002. It is now possible to model
surface precipitation to Fe oxide according to Farley and coworkers. A
number of bugs were also fixed. Two examples: (i) there was no label for
the Stern layer capacitance for the Constant Capacitance Model, and (ii)
when a finite solid was specified, the program sometimes crashed.
ver.
2.11. Released 21/7 2002. This version corrects one bug in ver 2.1: the
inclusion of finite solid phases did not work when using the new option
with definitions of concentrations on a per mass of material basis.
ver. 2.1. Released 18/7 2002. Apart from correcting several
small errors, this version includes an improvement of the counter-ion
accumulation description, so that ion-exchange sites with different
selectivity coefficients can be included. This is done by storing the
selectivity coefficients in different databases. Another novelty is the
option to define concentrations on a per mass of material basis (instead of
on a per mass of solution basis), see the updated help file
"vminhelp.htm" in your Visual MINTEQ folder.
ver.
2.02. Released 25/2 2002. This version corrects a few bugs; for example,
the sweep option works better, and it should now be possible to save an
input / output file on another drive. The maximum number of problems per
file has been increased to 150 - however, it is advised not to use too many
components in files with many problems.
ver.
2.01b. Released 5/12 2001. By mistake, the start version of
"Dabase.txt" was not included in the first ver. 2.01 release,
which may sometimes cause errors when trying to open the program. .
ver.
2.01. Released 5/12 2001. By mistake, the start version of
"Dabase.txt" was not included in the first Released
3/12 2001. This new version includes the Stockholm Humic Model (see:
Gustafsson, J.P. 2001. Journal of Colloid and Interface Science
244:102-112). The calculation part of the program has also been partly
restructured. The user will (hopefully) not notice this. It is now also
possible to run up to 100 problems at a time.
ver. 1.07. Released 1/10 2001. Includes improvements for the option
to calculate pH from both mass and charge balance, fixes for a number of
bugs i.e. for the option to include a fixed-charge site in adsorption
problems. It is now possible to define a site with only fixed (permanent)
charge.
ver.
1.06. Released 4/9 2001. I have forgotten what this was about. (A
server error destroyed my previous text about this version) Never mind, see
ver. 1.07 above.
ver
1.05a. Released 10/8
2001. A serious error in the code was discovered in the original ver. 1.05,
which caused erroneous results for the fixed ionic strength option.
ver
1.05. Released 9/8 2001. This version includes the new
option to calculate pH from both mass and charge balance considerations.
The number of allowed components has been increased from 28 to 56, it is
now possible to export the species distribution list to Excel, and a number
of small changes have been made to improve the execution speed. As for
bugs, the Debye-Hückel option now works correctly, and the Multi-problem
menu works better.
ver 1.04.
Released
4/7 2001. Corrected several small bugs. Two examples: In ver. 1.03 the
inclusion of other gases than CO2 did not work. The installation of Visual
MINTEQ in other drives than C:\VMINTEQ was impossible due to an error in
the installation file. This works now (I hope). An option was also included
that allows the user to set a low initial activity guess for components,
which may enable easier convergence in complicated problems.
ver
1.03. Released 2/1 2001. Corrected some errors that were
previously present for the Multi-Problem / Sweep options. These options
were also extended with (1) The possibility to make a sweep with the total
concentration of a component, and (2) A new titration manager, which can be
used to simulate equilibrium chemistry when a titrant with a defined
composition and volume is added to the original solution. The help files
were updated accordingly.
ver
1.02. Released 15/12 2000. Corrected several small
errors that were present in earlier versions. For example: The TPM surface
complexation option now works properly, and output lists from runs with
possible solids can now be viewed. It is now also possible to place Visual
MINTEQ in other directories than C:\VMINTEQ during installation, although
C:\VMINTEQ is still the preferred alternative. Furthermore, the name of the
current input file is displayed and results from the list of saturation
indices can now be exported to Excel.
ver
1.01. Released 3/7 2000. Corrected a bug which appeared
in ver. 1.00 when the user tried to read a previously saved adsorption
problem (the site concentration was sometimes incorrect). In addition,
minor errors in the help files were corrected.
ver 1.00.
Released 15/6 2000.
Last edited
2009-01-15
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