Total ion mass released

[David FR]

HI,

I am running a model to estimate the total release of different ions like Fe2+, HPO42-, and SiO2 from an andesite weathering for 1 Ma. Any advice how I could estimate the total amount of those ions during 1 Ma from the Gplot application or I should do it in a harder way? Cheers,

 

David

[Jia Wang]

Hello David,

It sounds like a delta plot might be what you are looking for. A delta plot shows change in a variable's value from the initial point in the reaction path. You can change the plot axis to "delta" in the XY Plot Configuration dialog. Please see section 6.2 XY Plot configuration in the GWB Reaction Modeling User Guide for more information.

Hope this helps,
Jia Wang
Aqueous Solutions LLC

[David FR]

Hi again,

 

sorry for bothering you with a similar question, but when I calculate the ion releas and mineral formation from the andesite weathering I always obtain the same result for any span of time. So the result is the same whether I run a model for 1 day or for 1 Ma. I have sorted the problem for the total release of ions when I consider the % of the total material produced in 1 year from  weathering 1 kg of rock assuming that is correct, but I cannot see how I can manage this issue when dealing with the secondary mineral formation. Any advice for this? Cheers,

 

 

David

[Brian Farrell]

Hi David,

It sounds like you're not using kinetics. In the absence of a kinetic rate law or mass transfer rate that you specify (or certain other processes, like an internal heat source production rate), time is arbitrary in a React simulation. It sounded like your original question was purely about retrieving information from the plotting program. But if you believe this is a non-equilibrium process, then you need to include reaction kinetics in your model. For more information, please see Chapter 4, Kinetic Reaction Paths, in the GWB Reaction Modeling Guide.

Hope this helps,

Brian Farrell
Aqueous Solutions