Date: Tue, 15 Nov 2005 11:40:59 -0800
Reply-To: Jim Kapin <jim**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Jim Kapin <jim**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Subject: Re: Questions About Perchloric Acid
Comments: cc: Gordon Miller
In-Reply-To: <p06110404bf9eec616f90**At_Symbol_Here**[]>

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**

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