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- PHREEQC Users | Resource for geochemists | Forum
phreeqcusers org: collaborative resource for geochemical modelling Upload input scripts, discuss geochemical problems and find examples of real-world applications of modelling
- PHREEQC Users | Resource for geochemists | Forum
PHREEQC Users PHREEQC Users is a new initiative aiming to provide a much needed discussion space for geochemists of all experience levels to share ideas and experience of using the PHREEQC code for a whole range of geochemical simulations What is PHREEQC? PHREEQC stands for PH REdox EQuilibrium (in C language) and is a widely used public-domain geochemical modelling software available from
- PHREEQC Users | Resource for geochemists | Forum
PHREEQC shows us that they all start to degass at the same pressure If I include "H20 (g) 0" in the GAS_PHASE, even H2O starts to degass when the other gases do Is there a way to get seperate bubble point pressures for each gas? Thanks for your help!
- PHREEQC Users | Resource for geochemists | Forum
Hi all, I'm not sure I'm posting this question in the correct sub-forum, but here goes: I'm working on coupling PHREEQC (currently just speciation calculations) with an external model that predicts microbial growth and metabolic dynamics The external model produces H+ concentrations as an output, and I want to use these values as an input for PHREEQC for speciation and pH calculation However
- PHREEQC Users | Resource for geochemists | Forum
In PHREEQC inverse modeling, you must define at least enough uncertainty to allow for charge balance I prefer analyses that balance within 5 or 10 percent (cations - anions) (cations + anions), and I like to see several analyses that demonstrate the same trends in concentrations
- PHREEQC Users | Resource for geochemists | Forum
phreeqcusers org: collaborative resource for geochemical modelling Upload input scripts, discuss geochemical problems and find examples of real-world applications of modelling
- PHREEQC Users | Resource for geochemists | Forum
Phreeqc dat uses the gram formula weight of N for the conversion of ppm nitrate to moles because that is the common reporting unit for many labs in the U S (as N) Perhaps your analysis is reported "as NO3", in which case you should use "ppm as NO3" in the second line of SOLUTION_SPREAD for N (5)
- PHREEQC Users | Resource for geochemists | Forum
PHREEQC treats that as a special case Of pH, Alkalinity, and C (4), only two of these items can be defined independently; the third can be calculated from the other two So, in your case, the pH is adjusted to be consistent with the Alkalinity and C (4) that you have defined
- PHREEQC Users | Resource for geochemists | Forum
In PHREEQC, Alkalinity is the total alkalinity from all species that are titrated in an alkalinity titration (including some negative contributions, like H+) It includes contributions from HCO3- and CO3-2, but also possibly OH-, H3SiO4-, H2BO3-, etc
- PHREEQC Users | Resource for geochemists | Forum
In this review, we provide some basic documentation, evaluate and compare the thermodynamic data files (TDFs) distributed along with PHREEQC, and attempt to outline the limits of their applicability We also used the TDFs to model examples of river water, seawater, groundwater, oil-field brine, and selected mineral solubility data for some oxides, oxy-hydroxides, hydroxides, aluminosilicates
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