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. 

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-----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

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