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The values of equilibrium coefficient and ion exchange capacity have been determined in relation to the concentration of hydrogen ion.
The equilibrium coefficient was obtained for each patch and for each component.
We chose propionic acid (PAc) and 1-propanol (PrOH) as organic solvents whose solubility parameter, log P, logarithmic partition equilibrium coefficient for octanol/water, is similar.
The adsorption equilibrium was calculated by Hill-de Boer equation for mixtures for 1000 combinations of the equilibrium coefficient of components 1 and 2. The amount adsorbed of each component could be obtained as the average value over the 1000 combinations.
Adsorption equilibrium coefficient.
The free energy of adsorption process, considering the adsorption equilibrium coefficient K 0, is given by the equation Delta G^{{^{0} }} = - RTln K_{0}, (2 where ΔG 0 is the standard free energy of adsorption (kJ mol−1), T is the temperature in Kelvin and R is the universal gas constant (8.314 J mol−1 K−1).
Similar(52)
The group equilibrium coefficients taking into account the interactions between the groups, and equilibrium coefficients for all substances considering interactions within the groups, are evaluated.
For them so-called local models were developed to determine equilibrium coefficients or relative volatilities.
Usually the equilibrium coefficients of all components are related to that of the dominant component.
It is shown that this group model provides a sufficiently precise and efficient evaluation of equilibrium coefficients for multicomponent mixtures during dynamic simulation.
Under these circumstances, the conventional equilibrium coefficients, such as Kd, Henry's Law constant H and the bioconcentration factor, BCF, are independent of the activity coefficient of the partitioning compound in the respective phases.
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