ZINC LEACHING WITH LACTATE

[AnnaJulIQ]

Hello everyone,
I'm trying to simulate zinc leaching with lactic acid but I don't know what I'm doing wrong.

DATABASE C:\users\Juliana Marin\Desktop\MINTEQ.DAT

TITLE Lactate
SOLUTION_MASTER_SPECIES 1
Lactate    Lactate     5.0   C3H6O3     90
SOLUTION_SPECIES
      Lactate = Lactate
      log_k 0
SOLUTION_SPECIES
Lactate + Zn+2 = LactateZn+2
   log_k 1.67
EQUILIBRIUM_PHASES
zincite 3.0
SOLUTION_MASTER_SPECIES  1
END

[dlparkhurst]

It is OK as far as it goes. Lactate should probably be Lactate- as master species, with another species HLactate, and LactateZn+ rather than LactateZn+2. I should add, for a more complex system, you need log Ks for all the other ions that bind with Lactate and compete with Zn (Ca, Mg, ...?).

To see the definitions do something, you need a SOLUTION. Here is a simple definition you could add at the end of your input file.

Code: [Select]

SOLUTION 1
-units mmol/kgw
pH 7
Ca 10
C(4) 1 charge
Lactate 1
Zn   0.1
END