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
An A.A. unit (atomic absorption).
Bill Hemp tech svc. w/ chemical supplier - Grand Rapids, Michigan
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