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I'm working with a relatively simple X1T model in which water 1 is injected into a sandstone containing water 2 for 22 years then chased through the system with water 1. During transport, the only attenuation process operating is an activity-KD retardation model. I'm trying to run this model using different porosity's, assuming that the rest of the volume is just non-reactive quartz. This should be a simple model. This model runs for certain values of concentrations and Kd's, but not others, although the model is fundamentally unchanged. The biggest problem is that the model is unable to initialize because the "Newton-Raphson did not converge...". I've been able to duplicate this issue in React. One issue I've noticed causes this problem is declaring a porosity. The modelled sandstone has a porosity of 0.25. When I run my react code using a blank porosity, blank bulk volume, and 0 inert volume (the default values), it's able to initialize. If I declare a porosity of 0.25, it is unable to initialize. Do you have any thoughts on what might be going on here or what I should look out for when trying to declare porosity values? I've referenced both the reaction guide and the reference guide and have not had much luck sorting this out. Thank you! Clark React_Issue.rea Kd_Ambrosia_Por=25_KD=0.029.sdat

I'm working on adding ferrihydrite sorption parameters to the existing FeOH sorption database, but for some reason my reaction, which I believe is charge balanced, throws an error saying that it is not. I'm attempting to add parameter >(s)FeOHRa++, charge = 2, mole weight = 298.8543, log k = -6.66, dlogk/dt = 0, with >(s)FeOH = 1 and Ra++ = 1. Do you have any suggestions here on where I've gone astray? If I run a React sorption model with the equation as written, does GWB still consider it? Edit: I've added Ra++ to the existing Minteq database, and it's charge is set at +2, molar mass 226, element Ra. Thanks, Clark

Hi, I am trying to look at the speciation of a solution passed through a peat soil and I was wondering if anyone could point me in the direction of datasets that include sorption sites on humic acids, etc. Thanks, Isaiah