Off hand I don't know the density of ZnI solutions but I would hazardous(!) a guess that something else might be safer and (perhaps not) cheaper. For years I was associated with heavy mineral separations using tetrabromoethane and other organic compounds. Safety was always a problem. I suggest you look at what www.geoliquids.com has to offer that might serve you better. Regards, Ernie Lippert -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Lazarski, Peter M. Sent: Thursday, June 14, 2007 7:24 AM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: Re: [DCHAS-L] ZnI question For trace analytical work, there are sub-boiling stills available which would probably be able to reconcentrate the ZnI solution without decomposing the ZnI. One vendor of such apparatus is http://www.savillex.com/catalog/index.php?cPath=57_169 This would probable work fine as long as no contaminants were introduced when the ZnI is diluted. The information contained in this e-mail message and any attachments may be confidential. It is intended only for the use of the individual or entities named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail at the originating address. Peter Lazarski National Grid USA Lab. & Testing Svcs., Bldg. 1 7437 Henry Clay Blvd. Liverpool, NY 13088 (315)460-2114 -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Debbie Decker Sent: Wednesday, June 13, 2007 8:01 PM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] ZnI question 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 **************************************************************************** **** This e-mail and any files transmitted with it, are confidential to National Grid and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error, please reply to this message and let the sender know.
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