Greetings: Please excuse the cross-posting - I need to cast a wide net. I've received the following question from a researcher in the Geology department. "I am using Zinc Iodide as a heavy liquid in my current lab procedure. I would like to re-use it but I am having trouble recycling it, I dilute it during my procedure and I am having difficulty distilling it back down to the desired specific gravity. I have built simple distilling apparatus (heating mantle, boiling flask and graham condenser) but the vapor that comes off the diluted zinc iodide is brown/purple and then a metallic film accumulates on the interior of the condenser. So, it seems like I am distilling more than water. It produces this purple vapor even at temperatures well below boiling" I think she's subliming off the iodine that then plates out on the cool surfaces of the condenser. But I don't have any creative ideas that will help her re-use the ZnI solution. Thanks for your help, Debbie ----------------------- Debbie M. Decker, Campus Chemical Safety Officer Environmental Health and Safety University of California, Davis 1 Shields Ave. Davis, CA 95616 (530)754-7964/(530)752-4527 (FAX) dmdecker**At_Symbol_Here**ucdavis.edu Co-Conspirator to Make the World A Better Place -- Visit www.HeroicStories.com and join the conspiracy
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