I don't know about Joe, but I would be interested in the details of both methods. Doug Pauls R Sedlak <rsedlak2000@YAHO O.COM> To Sent by: TechNet [log in to unmask] <[log in to unmask]> cc Subject 01/03/2006 01:11 [TN] Testing for Thiourea PM Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to R Sedlak <rsedlak2000@YAHO O.COM> 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. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------- Yahoo! Photos --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- Ring in the New Year with Photo Calendars. Add photos, events, holidays, whatever. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------