Data Basis for Model Development

In the lower 20 cm of the column, no more open pore space is found due to increased water saturation. The pyrite in this zone is not involved in the alteration of the column in relevant quantities. The results of the parameters important for the model development are represented in Fig. 4.1. It shows the cumulative amount of the iron release over time and the associated development in the oxygen depth distribution during the depyritization. Additionally, the pyrite content in the ideally unsaturated area of the column is plotted. It is the pyrite quantity, which is available for reactions with diffusively transported oxygen. 

Approximately a few days after the beginning of the experiment equilibrium between oxygen consumption and oxygen recharge is established. Subsequently, the oxygen penetrates more and more deeply into the column and thus reflects a progres- 

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