Date: Mon, 18 Jun 2007 14:35:44 -0400
Reply-To: Ernie Lippert <ernielippert**At_Symbol_Here**TOAST.NET>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Ernie Lippert <ernielippert**At_Symbol_Here**TOAST.NET>
Subject: Re: ZnI question
Comments: To: "Lazarski, Peter M."
In-Reply-To: <7FCB95300E34CD46831A79E87C3B148A8E5487**At_Symbol_Here**NYHCBMSG04.NA.NGRID.NET>
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 has to offer that might serve you better.
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

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


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 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)
Co-Conspirator to Make the World A
Better Place -- Visit and join the conspiracy

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