Date: Tue, 1 Dec 2009 05:29:58 -0800
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Craig Calvert <craig_a_calvert**At_Symbol_Here**YAHOO.COM>
Subject: Re: HF digestion safety
In-Reply-To: <F0878287277A634C92AA608455E652A80B3B45EEA3**At_Symbol_Here**>
There are sealed microwave digestion systems that would not release HF at all - CEM, Milest one, and Anton Parr.  They cost about the same as the scrubbing system and will digest your material faster and safer.

From: "Kohler, Chris E" <cekohler**At_Symbol_Here**INDIANA.EDU>
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Sent: Mon, November 30, 2009 1:56:59 PM
Subject: Re: [DCHAS-L] HF dige stion safety

We just installed an HF hood with plastic ducts and fan parts, etc. No scrubbers or filters though. You might check with Se ntry or Captair and check their ductless fume hoods to see if HF is an acce ptable application. I have heard the filters are expensive and you must be prepared to change them at the appropriate time. The other option may be to use a Parr bomb with a Teflon liner.


-----Original Mes sage-----
From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.ED U] On Behalf Of Joseph Passante
Sent: Monday, November 30, 2009 9:41 AM
To: DCHAS-L**At_Symbol_Here**LI ST.UVM.EDU
Subject: [DCHAS-L] HF digestion safety

Does anyone on this list have experience with proper exhaust design 
for smal l scale digestion using 48% HF?  The geochemistry researcher I  < BR>am working with anticipates evaporating 2 liters of concentrated HF  ;
per month in a fume hood.

I am interested in scrubbing technol ogies and if anyone has designed 
local exhaust systems that do no t involve a fume hood.



Joseph R. Passan te, CIH, CHO
Associate Director
Chemical Hygiene Officer
Environme ntal Health & Radiation Safety
University of Pennsylvania
215.746 .6550

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