Joe:
If your client wants to control Thiourea in an immersion Tin bath, you probably want more than a simple analysis for Thiourea. Thiourea is not consumed in the immersion Tin reaction, it is complexed, and moves from complexing the Tin, in a new bath, to complexing the dissolved Copper, as the bath is used.
My suspicion is that your client really wants to control for free, uncomplexed Thiourea...
I have two methods in my box of tricks, one for total Thiourea, by UV absorbtion, and a titration for uncomplexed Thiourea.
I can forward any/all... would this help?
Rudy Sedlak
RD Chemical Company
Joe Russeau <[log in to unmask]> wrote: Good Afternoon All,
Happy New Year to all of you. I have a question for a client who is looking to find a lab who has the ability to analyze for thiourea. My understanding is that this is an additive used for PCB's undergoing the immersion tin process. Does anyone know of a facility that has the ability to analyze for this substance?
Best Regards,
Joe Russeau
Process Analyst
Precision Analytical Laboratory, Inc.
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