electrical conductivity and TDS

[Mooketsi]

Hi i'm modeling a Ca-OH water type system recating it with CO2 and on another case with H2SO4. With CO2 the graphs on REACT correlates when plotting dissolved solids or EC versus CO2 reacted. However, when plotting the same using sulphuric acid it does not. what could be the problem?

 

regards,

[Tom Meuzelaar]

Hi Mooketsi:

 

Hard to tell without being able to look at your scripts. Can you attach the CO2 and HSO4 model scripts, any custom databases, and a quick summary of what behavior you expect in both cases?

 

Regards,

 

Tom Meuzelaar

RockWare, Inc.

[Mooketsi]

Hi Tom,

 

Thanks for your reply. I have attached the GSS file. I modelled two scenarios allowing for pptn. 1) Reacted with 2 g CO2(g) and 2) reacted with 2.5 g H2SO4. In scenario 1 the conductivity vs CO2 added correlates with TDS vs CO2 added. However, in scenario 2 it is not the case. This is what i'm investigating.

 

regards

[Tom Meuzelaar]

Hi Mooketsi:

 

I have your GSS file. Can you attach the React files as well?

 

Regards,

 

Tom Meuzelaar

RockWare, Inc.

[Mooketsi]

Hi Tom,

 

files attached for both cases.

[Tom Meuzelaar]

Thanks Mooketsi:

 

For your H₂SO₄ run, TDS appears to increase with H₂SO₄ reacted. Electrical conductivity, however, follows the concentration of the OH^- anions and H⁺ cations, which have stronger conductance values than the major anions and cations.

 

Refer to Standard Methods 2510A for further information.

 

I hope that helps,

 

Tom