From: Jeffrey Lewin <jclewin**At_Symbol_Here**MTU.EDU>
Subject: Re: [DCHAS-L] ductless fume hoods for acid digestion
Date: Mon, 26 Jan 2015 10:55:53 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CAEwQnqixSwYda0-eyTn58=w2B2UMcx-uEXO3StLTT9PcSgWRHA**At_Symbol_Here**
In-Reply-To <03811243-A0F1-4343-8073-46AA061042BC**At_Symbol_Here**>

Graduate students were doing acid digestions for ICP analysis in our standard exhausting fume hoods. Unfortunately, the high concentration of heated acid vapors was damaging duct work and control valves so we moved the operation to a wash down hood (originally designed for perchloric acid, but never used that way). However, that was only briefly used because they have now switched to microwave digestions.


On Mon, Jan 26, 2015 at 9:18 AM, Louis DiBerardinis <loudib**At_Symbol_Here**> wrote:
I would agree with Bob. It is possible but would have to be done carefully, verify the filters work, good ongoing maintenance, detection for breakthrough. See ANSI std Z9.5-2012. Section on ductless hoods for more detail..

Lou DiBerardinis
Director. EHS Office

Sent from my iPhone

On Jan 26, 2015, at 8:42 AM, Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM> wrote:


Doubtful it would work. Anything is possible, but this approach would be my last resort. My first option would be straight exhaust.


1) Charcoal filters primarily useful on organics.

2) Acids require activated filters which are tricky.

3) Give-back of filters when turned off.

4) Wide divergence on quality and support of companies making this type of filtered hood-some good many bad!

Very Truly Yours,

Dr. Bob Haugen

Director of Product and Technology Development

Flow Sciences Inc.

2025 Mercantile Drive

Leland, NC 28451

Phone 910 332 4878

From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of melissa.ballard**At_Symbol_Here**US.MICHELIN.COM
Sent: Monday, January 26, 2015 6:38 AM
Subject: [DCHAS-L] ductless fume hoods for acid digestion

Good morning all! I have to take a minute to get some additional opinions on a topic. I've been approached to provide my 2 cents on the appropriateness of using a ductless fume hood for acid digestion (preparing samples for analysis via AA). This would be for use in an industrial quality lab.

I have my opinion; what is yours?


Melissa D. Ballard, MSPH, CIH, CHO
Industrial Hygienist / Industrial Hygiene Chemist
Michelin North America
1401 Antioch Church Road
Greenville, SC 29605

Jeff Lewin
Departmental Laboratory Supervisor
Biological Sciences
Michigan Technological University

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