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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