Decide What Types of Model to Construct

But the charge-balance situation is even more complicated. To see this, consider the following points. 

Before constructing a detailed chemical model, we need to make the following decisions  

what types of geochemical reactions are to be included in the model  

Stoichiometric versus Speciated Charge Imbalance Example 2 

let s look at a real analysis reported by White et al. (1984). The tailings pore fluid sampled at the Riverton uranium mill tailings site in Wyoming is very acidic and contains high total dissolved solids. The table below shows the analysis. 

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