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Iron titration for acid pickle bath



(-----) 2006

What method would be usable to obtain an iron concentration via iron titration methodology?
What would an acceptable range for iron concentration in this bath be considering it's a 1000 gallon tank? what level would need to be time for a tank dump? I am new to system and previous employees did not keep any records so any help would be appreciated.. thanks

Sue Kufahl
pretreatment and painting company - Berlin, Wisconsin
^


2006

Sue -

A common titration for Fe+3 is a redox titration with sodium thiosulfate. You should be able to find details on the web or in a Chem textbook. It's important that Fe+3 be the only oxidizing agent in the bath however or you will get errors.

Consult your company internal specifications for guidelines on the concentration needed to maintain.

As far as tank life goes, you may have to run some experiments to determine that.

Terry Tomt
- Auburn, Washington
^


2006

And, Fe(+2) is commonly titrated with an oxidizer such as potassium dichromate or potassium permanganate.
What acid solution are you using, does it become yellow or green or ? To what pH do you titrate for acid, and does a rusty (red-brown) precipitate form? If so, the calculated acidity will be high, as some NaOH is consumed via Fe(OH)3 formation. An specific gravity data?
Please give info, and note some previous letters (from using the Search function):

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Ken Vlach [dec]
- Goleta, California

contributor of the year Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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