Applications and Case Studies > Acid mine/rock drainage

How to eliminate UNDIFINED values (N\A) in a Eh-pH diagram using PhreePlot

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Juan Sebastian:
Hello, I have problems with Undifined values when I plot a Eh-pH diagram using data of an acid mine drainage. I want to know, how can I eliminate this UNDEFINED values and generate a clean plot? I already looked the examples of the manual, but I don't realise what I doing wrong. Please help!


dlparkhurst:
You should write to David Kinniburgh for PhreePlot questions.

It is probably a better idea to make a pH-pO2 plot. You are less likely to get undefined values by being outside the stability field of water.

Juan Sebastian:
Thanks dlparkhurst, I just write to David Kinniburgh.

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