Input Editor Pane Adsorption

In this pane all parameters related to adsorption are set. It is only accessible when adsorbent components are present.

The number of adsorbent components is only displayed in this pane. Adding and removing adsorbing components is done in the input pane Components.

The adsorption model

The number of adsorbing sites depends on the number of adsorbent components and the adsorption model:

• In case of the simple surface complexation model, the number of adsorbent components equals the number of adsorbing sites.
• In case of the constant capacitance model, the number of adsorbent components has to be twice the number of adsorbing sites. Consequently, the number of adsorbent components has to be an even number.
• In case of the triple layer model, the number of adsorbent components has to be three times the number of adsorbing sites. Therefore, the number of adsorbent components has to be a multiple of 3.

Adding and removing adsorbing sites

Adsorbing sites can be added by clicking the "Add new adsorbing site" button. If this addition would yield an invalid set of data (see the rule for the number of adsorbent components and adsorbing sites above), a confirmation message will appear. The new adsorbing site will be added to the end of the list of adsorbing sites with no components selected. These can be modified afterwards.

The currently selected adsorbing site can be removed by clicking the "Remove selected adsorbing site" button. If this action would yield an invalid set of adsorption data, a confirmation message will appear.

If the set of adsorption data is invalid and can be fixed by changing the number of adsorbing sites alone, this can be done by clicking the "Adjust adsorbing sites" button. If adsorbing sites need to be removed, they will be removed from the end of the list. If you want to remove other adsorbing sites, you need to do this by selecting the appropriate adsorbing sites and clicking the "Remove selected adsorbing site" button.

Capacitances and surface areas

These parameters are only required for the Constant capacitance and Triple layer adsorption models. Therefore, they are not shown if the Simple surface complexation model is selected.