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Determine % Iron in Nitric & Ammonium Bifluoride Pickling Bath for Stainless Steel

Q. We have 2 Passivation tanks that contain 25% Nitric acid and Ammonium bifluoride. Does anyone have a titration method for determining the Iron content?

I saw a couple of different procedures on another thread, but for one, the procedure said the sample should be colorless then titrate to a pink endpoint. My sample is dark green, so the endpoint is difficult to see. The other procedure was very vague and didn't give the calculation factor. Any help would be greatly appreciated.

Staci Sorgee
- Easley, South Carolina, USA
June 14, 2017

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