I need to monitor a nitric dip tank that is being used for passivation of stainless steel parts. I have been told a conductivity analyzer is typically used for this. I am concerned that dissolved iron from the passivation process will have great enough influence on the conductivity of the solution that I cannot therefore use conductivity to measure the solution to maintain a concentration of 20-40% nitric acid by volume. How much iron can be dissolved in a bath of 20% nitric and what at what magnitude will it affect conductivity?




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