In both reaction media, there is a release of K+, SO4 2− and CrO4 2− from the KFe3[ SO4 2 − X(CrO4 X](OH 6 structure, although the latter is rapidly absorbed by the solid residues of Fe(OH 3 in alkaline medium dissolutions.
In the fractured porous medium, wormholing dissolution is observed while face dissolution occurs when microporosity is ignored for the same Péclet and Damköhler numbers.
In TEA·3HF/AN medium, the dissolution of Cu is very high.
The proposed process was composed of two hydrometallurgical steps; decopperization in H2SO4 medium and dissolution of selenium into NaOH solution.
Cultures were incubated with 500 μg ml−1 (final concentration) MTT dye (Sigma-Aldrich, Buchs, Switzerland) in PBS for 3 h, followed by removal of the medium and dissolution of the violet crystals in 200 μl of DMSO.
At the specified time (0.5, 1, 2, 4, 6 and 8 h), 8 mL of the dissolution medium was sampled, and fresh medium (8 mL) prewarmed at 37 °C was simultaneously added to the dissolution medium to maintain a constant volume throughout the test.
At predetermined time points, 5.0 mL aliquots were withdrawn from the dissolution medium and replaced with fresh medium to maintain a constant volume.
If needed, the whole dissolution medium was changed to the fresh medium in order to keep SiO2 concentrations < 30 ppm.
Ten mL of samples were withdrawn at predetermined interval times (hourly) for 10 hours from the dissolution medium and were replaced immediately with fresh medium.
All formulations failed f2 in the presence of dissolution medium containing 40% ethanol when compared to 0% ethanol medium (Table 6).
