Processes > Inverse modelling

Inverse modelling question

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joserevueltas94:
Hello everyone.

I am trying to make an inverse model of two water samples but I get this error and I don't know what it means

"ERROR: inequality not satisfied for N(5) eps-, 1.032364e-04"

I want to know what "eps-" means, Do I have to remove or to add some N(5) with a chemical reaction?

dlparkhurst:
If you get an ERROR message, it means that a model could not be found that satisfies all of the mole balance equations within the uncertainties that you specified. The problem may or may not be related to N(5) in your case.

Let's assume that N(5) increases from your solution 1 to solution 2. Is there a source for the increase in N(5)? You must either have an N(5) source or be able to make N(5) from reduced nitrogen sources with an oxidant like O2(g). Alternatively, you may not consider the change in N(5) to be significant, and you could ignore it with a greater uncertainty or by eliminating it from the calculation.

The error could be unrelated to N(5) and indicate a problem with other redox reactions.

In general, stop and think about the sources and sinks for each element and redox state in your solutions. You usually need a separate reactant for each element.

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