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Simple 1-D flow modeling - volume of Solution 0
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Topic: Simple 1-D flow modeling - volume of Solution 0 (Read 412 times)
Continuum
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Posts: 4
Simple 1-D flow modeling - volume of Solution 0
«
on:
June 20, 2019, 10:01:49 PM »
Hello,
I've been using Phreeqc and Phreeplot for awhile now and am currently modeling 1-D flow of a 500 uM Pb solution 0. Here is my the solution 0 input:
SOLUTION 0 #volume of Pb solution entering column
units mol/L
temp 24.0
pH 6.0
Na 0.01
Cl 0.0015
Pb 0.0005
-water 0.06 # is this correct?
I have a beaker containing 60 mL of the 500 uM Pb solution. I've divided my column up into 10 cells, each containing a volume of 1 mL. I understand that then the SOLUTION 1-10 should have -water 0.001. But for my infilling SOLUTION 0, is it correct to be using the full 60 mL volume? I have 150 shifts, so maybe the -water 0.06 needs to be divided by 150 shifts?
Thank you for your help.
Elliot
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dlparkhurst
Top Contributor
Posts: 2401
Re: Simple 1-D flow modeling - volume of Solution 0
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Reply #1 on:
June 20, 2019, 10:43:39 PM »
We usually use 1 L (actually 1 kgw) for the infilling solution and all cells. If you use different volumes for solution 0 than the column, the volume of water in each cell will be equal to the volume of solution 0 after one pore volume anyway.
You should then scale any moles of surfaces, exchangers, and phases that you put in the cells to be the number of moles per liter of water. If you use a volume other than a liter, then you would need to scale the moles of reactants accordingly.
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Continuum
Contributor
Posts: 4
Re: Simple 1-D flow modeling - volume of Solution 0
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Reply #2 on:
June 20, 2019, 11:03:08 PM »
Thank you. That is actually what I am doing. If I have, say, 10 total moles of surface sites in my column, should I be inputting 1 mole of surface site for each SURFACE 1-10? This way the sum of the 10 cells gets me the total 10 moles of surface sites.
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dlparkhurst
Top Contributor
Posts: 2401
Re: Simple 1-D flow modeling - volume of Solution 0
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Reply #3 on:
June 20, 2019, 11:54:55 PM »
You need to determine the number of moles of sites per liter of water. That will be the number of moles to put in each cell assuming you use ~1 L of water per cell.
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Simple 1-D flow modeling - volume of Solution 0