Conceptual Models > Equilibrium assumptions

Corrosion risk / Solution equilibrium

(1/1)

AAN:
Dear all

I would like to determine how far the solution is from stability to contribute to an understanding of the risk of corrosion when transported in distribution network.

How is the approach in Phreeqc?
Is it as simple as:
1. EQUILIBRIUM_PHASES 1
2. END

I have measurements of following parameters:
Physicochemical parameters    Sample_01
Temp [dC]   11,6
pH   7,9
Bicarbonate (HCO3+) [mg/l]   395
Conductivitye [mS/m]   180
Chlorid (Cl-) [mg/l]   339
Oxygen (O2) [mg/l]   10,7
Iron, total ((Fe2+ og Fe3+)) [mg/l]   0,046
Iron, filt (Fe2+) [mg/l]   < 0,01
Mangan (Mn) [mg/l]   < 0,002
Calcium (Ca2+) [mg/l]   138
Magnesium  (Mg2+) [mg/l]   45
Sodium(Na+) [mg/l]   196
Potassium (K+) [mg/l]   14
Sulfate (SO42-) [mg/l]   168
Nitrate (NO3-) [mg/l]   2,2
Hardness (German degree ) [dH]   29,7
Total hardness  (TH) [meq/L]   10,6
Carbonate hardness  (CH) [meq/L]   6,5
Non-carbonate hardness  (NCH) [meq/L]   4,1
Hardness [mg/L as CaCO3]    530
Acidity, TAC [meq/L]   8,1

dlparkhurst:
It may be as easy as that, if you are looking for calcium carbonate precipitation potential.

Using your data, it would look something like this. (Using decimal points. Check out http://ac4e.omnisys.nl for an Excel version of Phreeqc that should be able to handle the use of decimal commas.)

SOLUTION 1
Temp  11.6
pH   7.9
-units mg/L
Alkalinity  395 as HCO3
Cl          339
O(0)         10.7
Ca          138
Mg           45
Na          196
K            14
S(6)        168
N(5)          2.2 as NO3
END
USE solution 1
EQUILIBRIUM_PHASES 1
Calcite 0 0
END

Navigation

[0] Message Index