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ruth

arsenic speciation

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Hi Tom,

I am trying to model the theoretical chemical speciation of arsenic using the bulk chemical composition of the water.

My question is if the program can distinguish that I am using the total concentration of arsenic as input for the program of the GWB?

This is because the basis species for the arsenic is As(OH)4-

Thank you very much

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Hi Ruth:

This should work fine- just be sure to:

  • constrain the oxygen concentration in the system
  • specify a pH
  • convert your total As concentration to the arsenic basis species

GWB will speciate all of your arsenic among all dissolved arsenic species in the thermo database according to their equilibrium constants.

Let me know how I can be of further help.

Regards,

Tom Meuzelaar

RockWare, Inc.

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