Jump to content
Geochemist's Workbench Support Forum

Unexpected pH drop with increasing W:R


Recommended Posts

Hello GWB support,


I'm investigating the change in fluid pH associated with water-rock reactions with changing water-to-rock ratio (W:R) and temperature. I find that the pH change tracks nicely with the formation of a particular mineral but there is a sudden drop in pH going from W:R = n to W:R = n+1 that I cannot explain. It happens at both high and low temperatures, at the same W:R. I originally thought it was some kind of mineral buffer effect, but I have suppressed everything I could think of to simplify the problem as much as possible following advice from Brian F., but this jump still baffles me.


I'd very much value your insight.


I'd rather not post my script here, but would be happy to email it to you, as well as xls file with the data plotted.



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...