markfp Posted March 23, 2015 Share Posted March 23, 2015 Hi, I have been using GSS and SpecE8 to calculate activity coefficients and perform concentration unit conversions in brine solutions with extremely high ionic strength. I have noticed that when converting between g/kg (ppt) to mol/l, the converted values are off by 1-2 moles compared to values obtained by doing 'long-hand' calculations using density measurements. Also, I am interested in activity of H2O, and this parameter is drastically lower when calculated with SpecE8 than when measured using a calibrated relative humidity meter. I have loaded the thermo dataset thermo_hmw, which should employ Pitzer equations for calculations at high ionic strength, and have been applied previously to solutions analogous to mine. I was wondering whether I have made some error or whether I am outside the usability of the hmw dataset in the GWB Student edition. An example dataset: raw data in g/kg: Mg++ 75.44 Na+ 0.3047 K+ 1.097 SO4-- 102.9 Cl- 119.3 density: 1.227 g/cm^3 Quote Link to comment Share on other sites More sharing options...
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