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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
TITLE Example 19.--Linear, Freundlich and Langmuir isotherms for
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Cd sorption on loamy sand. Calculates Example 7.1
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from Appelo and Postma, 2005. Data from Christensen, 1984.
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SURFACE_MASTER_SPECIES
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Linear Linear
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Freundlich Freundlich
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Langmuir Langmuir
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SURFACE_SPECIES
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Linear = Linear
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Linear + Cd+2 = LinearCd+2
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-log_k -100.7 # log10(0.2) - 100
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-mole_balance LinearCdCl2
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Freundlich = Freundlich
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Freundlich + 0.722 Cd+2 = FreundlichCd+2
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-log_k -102.61 # log10(0.421) + (0.722 - 1) * log10(112.4e6) - 100
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-no_check
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-mole_balance FreundlichCdCl2
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Langmuir = Langmuir
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Langmuir + Cd+2 = LangmuirCd+2
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-log_k 6.56 # log10(112.4 / 30.9e-6)
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-mole_balance LangmuirCdCl2
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SURFACE 1
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Linear 1e100 1 1
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Freundlich 1e100 1 1
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Langmuir 8.45e-8 1 1 # 9.5 / 112.4e6
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-no_edl
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SOLUTION 1
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pH 6
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Ca 1
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Cl 2
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REACTION 1
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CdCl2 1
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0.7e-6 in 20
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USER_GRAPH Example 19
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-headings Linear Freundlich Langmuir
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-chart_title "Sorption Isotherms"
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-axis_titles "Dissolved Cd, in micrograms per kilogram water" \
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"Sorbed Cd, in micrograms per gram soil"
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-plot_tsv_file ex19_meas.tsv
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-axis_scale x_axis 0 40
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-axis_scale y_axis 0 6
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-initial_solutions true
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-start
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10 x = act("Cd+2") * 112.4e6
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20 PLOT_XY x, mol("LinearCd+2")*112e6, color = Green, symbol = None, line_width = 2
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30 PLOT_XY x, mol("FreundlichCd+2")*112e6, color = Blue, symbol = None, line_width = 2
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40 PLOT_XY x, mol("LangmuirCd+2")*112e6, color = Orange, symbol = None, line_width = 2
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-end
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PRINT
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-reset false
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END |