Joel H

Hi Tom, I'm going to email you my input script. I think I may have narrowed the problem down somewhat. I have a working X1t script that is based on the "weathering profile" example from the users manual. I started copying my X1t script line by line into the weathering simulation (that I know works based on past experience) and then reran the weathering simulation each time I changed a line to a new value based on the simulation that is currently experiencing this error. The working simulation crashed with the same error message X1t stop: apply_constraint: Bad conversion when I tried to copy in the "inlet fluid" values from the bad simulation. I'm going to now go through the inlet fluid values line by line and see if I can isolate the problem further, but if you notice something right away that appears incorrect, please let me know. Thanks again for the help Tom, Joel

Hi Tom et al., I am attempting to run a 1D simulation of reactive transport in a basaltic aquifer and I am getting the error message: X1t stop: apply_constraint: Bad conversion every time I attempt to run the simulation. This error results in X1t quitting. Have you seen this error message before, and if so, do you know what causes it? Thanks very much, Joel Hurowitz

Hi Tom, Ug. Yes that got me there. It was a calculation error on my molecular weights. That's what I get for not double-checking my formulas in Excel before input into the database. Sorry to have bugged you with such a mundane problem - I'm embarrassed to have posted this thread on the forum at all! Thanks so much for your help, Joel

Hi Tom et al., I am trying to add a number of mineral phases to the thermo.com.v8.r6+ database, and I am consistently getting error messages for two of the phases I have entered. I was wondering if someone could take a look at the following entries to see if I am doing something incorrectly: Sodic Sanidine type= Feldspar formula= K0.51Na0.45Ca0.04Al1.04Si2.96O8 mole vol.= 100.75 cc mole wt.= 270.061 g 7 species in reaction -4.1600 H+ 0.5100 K+ 0.0400 Ca++ 0.4500 Na+ 1.0400 Al+++ 2.9600 SiO2(aq) 2.0800 H2O 500.0000 1.3900 500.0000 500.0000 500.0000 500.0000 500.0000 500.0000 TiMt type= Spinel formula= Fe2.45Ti0.55O4 mole vol.= 45.25 cc mole wt.= 178.543 g 5 species in reaction -5.8000 H+ 1.5500 Fe++ 0.5500 Ti(OH)4(aq) 1.8000 H2O 0.9000 Fe+++ 500.0000 14.0200 500.0000 500.0000 500.0000 500.0000 500.0000 500.0000 As you can see, these are solid solutions. I am calculating log K's at 25C assuming ideal mixing after Gislason and Arnorsson (1993), Chemical Geology. I've input 5 other solid solutions and had no problem, but I get the following error messages for these two phases when I try to load the modified database: reaction mass imbalance for Sodic Sanidine = 1.02 Reaction = Sodic Sanidine + 4.16*H+ = .51*K+ + .04*Ca++ + .45*Na+ + 1.04*Al+++ + 2.96*SiO2(aq) + 2.08*H2O reaction mass imbalance for TiMt = 48.6 Reaction = TiMt + 5.8*H+ = 1.55*Fe++ + .55*Ti(OH)4(aq) + .9*Fe+++ + 1.8*H2O I'm guessing I've made a stupid math error somewhere when balancing my reactions, but I'll be darned if I can figure out where it is. Any help is greatly appreciated! Thanks, Joel