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Copper content detection in ferric chloride etchant during etching process

Q. I will be very grateful to the person who can give me an idea about how to detect the amount of copper content in a ferric chloride ⇦ this on eBay or Amazon [affil links] Solution used for an etching process. Any detection method will be fruitful to my investigation but if someone knows about a colorimetric way or a conductivity method then it will be the apogee. Thanks in advance for any help.

Heeranraj Mohabirsingh
- Mauritius
2002

A. I would suggest a titration where you titrate with a standard solution of something that will precipitate the copper out without precipitating out anything else (for example the iron). Then you can follow the titration using a Redox electrode and look for the inflection point. Obviously atomic absorption ⇦ this on eBay or Amazon [affil links] and ICP ⇦ this on eBay [affil link] work very well but are quite expensive.

Terry Tomt
- Auburn, Washington

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