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RE: Nitrogen redox

Please review the attached file.  

Problem:  Product water is injected into an aquifer and begins to mix,
simulated by progressive amounts of product water added to 1 liter of
groundwater.  What are the effects on manganese concentrations assuming
birnessite solubility and redox are the controlling factors?

1.  If I assume N2 and NO2 are stable, as in this file, manganese
concentrations are held to 1 nM or less.  However, assuming only nitrate
and ammonia are stable results in >5 orders of magnitude increase in
manganese concentration.  Why does this occur and which state is more

2.  Is the problem posed correctly in this file?

Thanks for your time.

-----Original Message-----
From: David L Parkhurst [mailto:dlpark@xxxxxxxx] 
Sent: January 29, 2003 3:57 PM
To: Schroth, Brian/SAC
Subject: RE: Nitrogen redox

Sorry, I can't go through all of these files and permutations. Please
boil it down to one file with questions.


David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled

Attachment: titration of prod.pqi
Description: titration of prod.pqi

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