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Subject: Re: ZnI question
Date: Thu, 14 Jun 2007 07:23:54 -0400
Author: "Lazarski, Peter M."
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Subject: Re: Fw: [DCHAS-L] ZnI question
Date: Thu, 14 Jun 2007 16:09:04 +0000
Author: roger.o.mcclellan**At_Symbol_Here**ATT.NET
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Date: Thu, 14 Jun 2007 07:43:35 -0400
Reply-To: kauletta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Kim Auletta <kauletta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU>
Subject: Fw: [DCHAS-L] ZnI question
I sent the question on to our Geo/chemist & this was his reply. Hope it
helps.
Kim Auletta
Lab Safety Specialist
EH&S Z=6200
kauletta**At_Symbol_Here**notes.cc.sunysb.edu
632-3032
----- Forwarded by Kim Auletta/Admin on 06/14/2007 07:42 AM -----
John Parise/CAS
06/14/2007 07:24 AM
To
Kim Auletta/Admin**At_Symbol_Here**SUNYSB
cc
Subject
Re: Fw: [DCHAS-L] ZnI question
Quick reply
My guess is heating might lead to hydrolysis - formation of zinc
hydroxide and formation of hydroen iodide (ZnI2 + H2O -> Zn(OH)2 + 2HI
which then comes off? Acid would drive the reaction towards ZnI2
Try adding acetic (or something else acid that does not react with
anything in the system and heating?
Actually I just did a google search ....
Try this
http://academic.evergreen.edu/curricular/matterandmotion/labs%5CZnI.htm
I knew I had done this before! About 35 years ago
John
John B. Parise
Professor
Department of Geosciences
Department of Chemistry
State University of New York
NY 11794-2100, USA
+1-631-632-8196 - office (-8197, -1140, -8158 labs)
+1-631-632-8240 (-8140) FAX
EPO: John.parise**At_Symbol_Here**sunysb.edu
Kim Auletta/Admin wrote on 06/14/2007 07:11:11 AM:
> THought I'd bounce this email question to you - any thoughts on her
problem?
>
> Kim Auletta
> Lab Safety Specialist
> EH&S Z=6200
> kauletta**At_Symbol_Here**notes.cc.sunysb.edu
> 632-3032
> ----- Forwarded by Kim Auletta/Admin on 06/14/2007 07:09 AM -----
>
> Debbie Decker
> Sent by: DCHAS-L Discussion List
>
> 06/13/2007 09:14 PM
>
> Please respond to
> Debbie Decker
>
> To
>
> DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
>
> cc
>
> 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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