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(CO2)2
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Topic: (CO2)2 (Read 1591 times)
nguyenp123
Contributor
Posts: 4
(CO2)2
«
on:
November 08, 2017, 10:24:36 AM »
Hello, I am a beginner at PHREEQC. I am trying to see how particular elements change at different pH. My input and output is below, I am wondering what the (CO2)2 species is? Thank you.
Input:
SOLUTION 1
temp 25
pH 4
pe 4
redox pe
units mmol/kgw
density 1
C 1
output:
CO2 9.96E-04
HCO3- 4.47E-06
(CO2)2 1.82E-08
CO3-2 2.15E-12
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dlparkhurst
Top Contributor
Posts: 3088
Re: (CO2)2
«
Reply #1 on:
November 08, 2017, 03:23:27 PM »
It was added to fit CO2 solubilities at high CO2 pressures. Its concentrations should be small under most conditions. The Pitzer database uses activity coefficient parameters to account for the same effects.
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nguyenp123
Contributor
Posts: 4
Re: (CO2)2
«
Reply #2 on:
November 15, 2017, 12:18:37 PM »
Thank you
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(CO2)2