MICORP assumes a constant bulk phase sulfate concentration. What do I do for lab tests in bottles with decreasing sulfate concentration with time?
Lab tests typically lasts for only a week or a month during which charge transfer is likely dominating because pit depth is relatively shallow. This means variations in sulfate concentration do not matter much for pit growth. You may use an estimated average sulfate concentration to do simulation. Remember, you can always plug in different sulfate concentration values to test its sensitivity. This can tell you how accurate your approximation is. For long term tests under stagnant condition, please contact Prof. Gu to custom build the software for you. (In some lab tests by civil engineers, a sulfate concentration of less than 1 mM is sometimes used to simulate wastewater.
