Jump to content
Geochemist's Workbench Support Forum

How to convert mg/L to activity?

Recommended Posts

Hi, I am using the ACT2 app to create a predominance diagram with lead and carbonate. I would like to fix the dissolved inorganic carbon in the system. My DIC is 5 mg/L. Could anyone help me convert that to "activity?" Thanks!

Link to comment
Share on other sites


There are a couple of options for this. In some dilute fluids, you may assume that the activity coefficient is close to 1 and the molal concentration roughly the same as the activity. 

If you have a fluid analysis, you can also use SpecE8 to calculate the distribution of mass amongst species. SpecE8 will also report the activity for each species which can be used to set up your Activity diagram.

For more information on using SpecE8, refer to section 7 in the GWB Essentials User Guide. 

Hope this helps,
Jia Wang
Aqueous Solutions LLC

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...