Jump to content
Geochemist's Workbench Support Forum

Simple La3+, LaOH2+, La(OH)2+, La(OH)3 speciation diagram


Recommended Posts


I am trying to generate a simple La3+, LaOH2+, La(OH)2+, La(OH)3 speciation diagram in React but so far I have been unsuccessful with my approach (attached).  Eventually, I want to be able to add in other species.  So guidance on this 101 problem will be very much appreciated.  

Many thanks!


La React file.rea

Link to comment
Share on other sites

Hello Kaizen,

I took a look in your input file and here are a couple of suggestions. To look at the speciation of La+++, you would need to add the species and the associated Log Ks for the reactions into the database. Without your thermo file, I am guessing that you might want to check whether or not the species you are interested in are all there and double check the Log K values. Please refer to section 9.2.3 in the GWB Essentials Guide for more information.

React defaults to using Cl- as the balancing species but in this case you might not need to have a charge balancing species since you are generating a speciation diagram. You can turn off balance species by clicking on the units of a species and select do not balance. You can then eliminate Cl- from your basis pane.

Lastly, note that La(OH)3 is a mineral in the thermo.V8.R6+.tdat database. If the mineral precipitates, you will be able to see its calculated quantity under the variable type: ‘Mineral’ and not under ‘Species concentration’.  

Hope this helps.


Jia Wang

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...