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Testing for free iron content in acidic solutions

I currently have 2 stainless steel passivation tanks. A 21% nitric acid solution with sodium dichromate and a 50% nitric acid solution. I also have a stainless steel etch tank filled with Wyandotte DS9-314. What is the lab procedure to check these solutions for free iron? The passivation and etch are in accordance with ASTM A967.

Lawrence Cole
- Ogden, Utah, USA
2002

An A.A. unit (atomic absorption) ⇦ on eBay or Amazon [affil links] .

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan
2002

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