Date: Thu, 29 Jan 2009 12:06:31 -0500
Reply-To: List Moderator <ecgrants**At_Symbol_Here**UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: List Moderator <ecgrants**At_Symbol_Here**UVM.EDU>
Subject: 3 RE: [DCHAS-L] Testing regular Laboratory Fume hoods

Date: January 29, 2009 10:25:11 AM EST (CA)
Subject: RE: [DCHAS-L] Testing regular Laboratory Fume hoods ducts for  
perchlorates as a standard practice before dismantling

 >I will also be involved in dismantling a fume hood that used HF.   
What should I be concerned with?

Not sure if this is what you are looking for or not, but thought I  
would throw it out there.  AIHA/ANSI has a standard regarding  
laboratory decommissioning which may provide some insight.  I have  
attached the link to the AIHA market place for information regarding  
the document.

Best Regards,
Brian M. Spears, CIH, CSP, CHMM
Associate Industrial Hygiene Specialist
Safe Work IS Our Job
Dow Corning Corporation
4770 Highway 42 East
Carrollton, KY 41008
office:  (502) 732-2726
mobile:  (502) 682-8593


From: "Long, Don" 
Date: January 29, 2009 10:37:15 AM EST (CA)
Subject: RE: [DCHAS-L] Testing regular Laboratory Fume hoods ducts for  
perchlorates as a standard practice before dismantling

I don't know if this will provide any help at all, but working in a  
Chemical Weapons Demil Lab we've had similar experiences, whether it  
be dismantling the hoods due to building demo or work within the duct  
work itself. We performed wipe sampling on our hoods and associated  
ductwork, and then developed analytical methods to extract and analyze  
these samples to ensure that they we're "chemical agent free". This  
was later turned into an actual SW-846 method.

I say all of this because there may or may not be published methods  
out there for these circumstances (although we all know that someone  
has done it), so depending on your expected level of contamination,  
safety concerns, etc, you may end up having to develop your own  
sampling and test methods.

I also would be interested in if there is any additional info out  
there since in our line of work, we seem to get more concerned with  
the chemical agents we deal with than the other "less glamorous"  
chemicals that are no less hazardous.

Don A. Long

Southwest Research Institute Laboratory

Pine Bluff Chemical Agent Disposal Facility

PO Box 20130
White Hall, AR  71612


From: "Dr. Jay A. Young" 
Date: January 29, 2009 10:50:06 AM EST (CA)
Subject: Re: [DCHAS-L] Testing regular Laboratory Fume hoods ducts for  
perchlorates as a standard practice before dismantling

 >Before dismantling for disposal, do you have a standard practice of  
testing regular Laboratory Chemical Fume hoods ducts for the presence  
of perchlorates?   (I'm not talking about Perchloric Acid Fume hood  

Dear Prabhat,

The possible consequences of dismantling a hood and ducts and fan that  
in fact contain residues from past perchloric acid usage can be  
catastrophic, even fatal.

The fact that you have had no incidents thus far could mean one of two  

1. The hoods were not ever used for perchloric acid treatments of any  


2. The hoods were used for perchloric acid treatments and you have  
somehow been lucky.

Conclusion: Choose 1 or choose 2 and accept the consequences.  (As for  
myself, I would choose 2 and dismantle the remaining hoods assuming  
that they were contaminated.)

Jay Young

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