'Basis pane' diaporamas de présentation

200

400. -. HSO. 4. 300. Some species (mmolal). 200. +. H. +. FeCl. 100. --. SO. 4. +++. ( aq ). Fe. O. 2. 0. 0. 200. 400. 600. 800. O. (aq) reacted (mmolal). 2. Pyrite. Balancing reactions. Hematite.

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Use the Pitzer equations for calculations at high ionic strength.

Add species to the Basis pane. Use the Pitzer equations for calculations at high ionic strength. . Mineral saturation states calculated using the Debye-Huckel equation for activity coefficients. Field evidence suggests Halite and Anhydrite

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To create a speciation diagram, define an initial system composed of the species to be diagrammed

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Fluid 1: Cold, oxygenated seawater

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Enter fluid composition on the Basis pane

Enter fluid composition on the Basis pane. Simulate evaporation by removing solvent water from the system. File ? Open ? Thermo Data. Open a dataset using the Pitzer equations for modeling high ionic strength systems. Minerals precipitated during the evaporation of seawater,

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Enter end time

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Config ? Redox Couples...

Config ? Redox Couples. Add species to the Basis pane. Decouple any redox species for which analyses in multiple oxidation states are available. Decouple Fe 3+ from Fe 2+ and As(OH) 4 ? from AsO 4 3 ?. e ? is swapped in for O 2 (aq), then Eh is

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Enter your fluid composition on the Basis pane.

Enter your fluid composition on the Basis pane. Swap in gases of known fugacity. O 2 (g) is swapped in for O 2 (aq) and the combination of CO 2 (g) and HCO 3 ? constrain pH. Go to the Results pane, click Run, then view printed or plotted results.

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pH 7.8 Na-HCO 3 water

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