How to plot time vs concentration.

[lorerave]

I would like to track the concentration in my solution during reaction. Could anyone suggest me which function should I use. Thank you

[dlparkhurst]

The Basic Function TOTAL_TIME gives the elapsed time since the beginning of the simulation. TOTAL_TIME only applies to KINETICS, TRANSPORT, and optionally in ADVECTION calculations.  If you are doing one of these types of calculations, you can use TOTAL_TIME as the X variable in USER_GRAPH.

Here is a simple example:

Code: [Select]

SOLUTION
KINETICS
Calcite
 -m     3.e-3
 -parms 1.67e5   0.6  # cm^2/mol calcite, exp factor
 -time  86400 in 10
INCREMENTAL_REACTIONS true
EQUILIBRIUM_PHASES
CO2(g) -3.4 10
USER_GRAPH 1
    -headings               time TOT("Ca")
    -axis_titles            "Time, days" "Concentration" ""
    -initial_solutions      false
    -connect_simulations    true
    -plot_concentration_vs  t
  -start
10 graph_x TOTAL_TIME / 86400
20 graph_y TOT("Ca")
  -end
END