By Gould R.F. (ed.)
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Extra info for Addition and Condensation Polymerization Processes
16). According to Eq. 71 every oxygen concentration is (analytically) assigned to a certain hydrogen content. e. 6105 Pa. 2105 Pa. ) 42 Theoretical Background Fig. 15 Left: EH-pH diagram for the system Fe-O2-H2O (at 25°C, the numbers 1-11 correspond to the reaction equations described in the text for the calculation of the stability fields, modified after Langmuir 1997) Right: EH-pH diagram for the system Fe-O2-H2O-CO2 (at 25°C, P(CO2) = 10-2 atm), for fields where the total activity is < 10-6 (1) resp.
10-4 mol/L) could be dissolved compared to that of the solidsolution mineral phase. This example shows a tendency with solid-solution minerals. e. the solid-solution mineral is formed but not one of the pure mineral phases. The prominence of this phenomenon depends upon the values of the activity coefficient of the solidsolution component. For the calculation of solid-solution mineral behavior, two conceptual models may be used: the end-member model (arbitrary mixing of two or more phases) and the site-mixing model (substituting elements can replace certain elements only at certain sites within the crystal structure).
Solid solutions The examination of naturally occurring minerals shows, that pure mineral phases are rare. In particular they frequently contain trace elements as well as common elements. Classic examples of solid-solution minerals are dolomite or the calcite/rhodocrosite, calcite/strontianite, and calcite/otavite systems. Equilibrium reactions 23 For these carbonates, the calculation of the saturation index gets more difficult. ) That means that a certain activity ratio of Sr and Ca in aqueous solution is associated with a certain activity ratio in the minerals.