Kenton

I am using GWB v7 with a modified Minteq database. I have selected ferrihydrite as my sorbing mineral and selected the FeOH_Minteq sorption file then selected constant potential with and added a negative value. I don't seem to be able to yield a result. Could you please look at this and give a hint as to what i need to do to proceed? It seems like this should be more staight forward than what i am experiencing. 39D RWnewMT S3S1 110111.rea