Hi Gordon - I will leave the argument about minimum quantities to others,
but as far as I know, there are 2 good approaches to lab-scale scrubbing for
perchloric work.  The least expensive is "fume eradicator" glassware from
GFS Chemicals that captures and scrubs vapors in water.  An more
sophisticated (and expensive) alternative is to use the systems developed
for Kjeldahl digestions that have built in capture and scrubbing systems.
As I recall, Bucchi has a nice system.

Let me know and I can dig up the relevant details - Jim

James Kapin, MPH, CIH
Advanced Chemical Safety
858-874-5577 Cell 619-990-5955
 

-----Original Message-----
From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of
Gordon Miller
Sent: Monday, November 14, 2005 5:41 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] Questions About Perchloric Acid
Importance: Low

I have one good question and two dumb ones. They are:

What is a good chemistry and design for a scrubber to be used to 
control emissions of perchloric acid from small scale heating 
operations done in common hoods?

Is there a quantity of perchloric acid that is so small that it can 
be handled without benefit of a special hood, even if heated (Is 
there a de minimis quantity)?

What is the derivation of the NFPA 45 requirement that HClO4 not be 
heated by flame or in an oil bath? I can guess, but I don't know.

Please advise. "Inquiring minds want to know."

Gordon Miller
Lawrence Livermore National Laboratory
P.O. Box 808  (L-379)
Livermore, California 94550
(925) 423-8036
Fax (925) 422-5176
miller22**At_Symbol_Here**llnl.gov

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