Stanislav

I calculated charge imbalance in my samples manually and I've got less than 15% while GWB calculates it to be 96%. I must have something wrong with the data organization. Do maybe can spot where is the problem? Thank you.

Hi, Is there any available database that contains vermiculite? I am currently using LNLL database but I want to calculate saturation index of vermiculite. If no database is available, is it possible to add vermiculite to existing database? How? Thank you, Stanislaw

Hi, I apologize if that's a silly question. I am trying to calculate thermodynamic coefficients, elements speciation and saturation indices for bunch of aqueous samples. The concentrations of major ions does not vary significantly, although charge imbalance jumps from -90% to +90%. I was trying to manually manipulate values of Cl- or Na+ to figure out how sensitive the calculations. I was significantly changing numbers for major cations but the charge imbalance stayed the same. How is that possible? How charge imbalance is calculated in that case? Thank you for your help, Stanislaw

My understanding of your answer is that no matter if I pick Fe3+ or Fe2+ in GSS the program computes Fe speciation correctly based on that Fe3+ OR Fe2+ concentration and other parameters (T, pH, Eh, O2). And it applies to other elements as well. Am I right? My analytical instrument does not provide information about speciation, only total concentration.

I am a new user of GWB and I am not sure what chemical species I should choose while organizing the spreadsheet. My samples were measured on ICPOES and the results are total masses (mg/l) of each element, not masses of each ion. When I try to add an analyte, software doesn't allow me to choose e.g. Mn total and asks me to choose between Mn2+ and MnO4- and I want to use GWB to determine speciation. I right-clicked on each analyte and I chosen "As - Mn" but the charge imbalance is very high (30%) so I think something is wrong with the spreadsheet. Thank you for the help.