Br2 - MW 160 g/mole - volatile, but much heavier than air (effective MW ~
30 g/mole). Not surprising that a hood would have problems exhausting Br2
vapor.

On 11/4/15 8:25 AM, "DCHAS-L Discussion List on behalf of Weeks Jr.,

Robert" <dchas-l**At_Symbol_Here**med.cornell.edu on behalf of rweeks**At_Symbol_Here**LANL.GOV> wrote:

>Yes, I used Br2 as a cleaning solvent substance for certain phosphorus
>compounds and occasionally/frequently the bromine would escape the hood..
>One shallow breath of the escaped fumes caused pronounced respiratory
>distress.
>
>-----Original Message-----
>From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf
>Of Dr Bob
>Sent: Wednesday, November 04, 2015 6:59 AM
>To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
>Subject: Re: [DCHAS-L] OccHygPro: Chemical laboratory guidelines when
>working with Bromine...
>
>Hello Andrew / Ralph:
>
>If Bromine is used inside hood, two primary possibilities are:
>
>1) Leakage from the hood into workspace (low face velocity, materials
>too close to sash, other breaches in hood containment).
>2) Re-entrainment of exhaust back into lab space once fumes are
>exhausted from the building.
>
>Other factors could also be at work as well, too many possibilities to
>completely outline here, but lab configuration and subtleties of HVAC
>come to mind. GOOD LUCK!
>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
>
>-----Original Message-----
>From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf
>Of Secretary, ACS Division of Chemical Health and Safety
>Sent: Wednesday, November 04, 2015 8:03 AM
>To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
>Subject: [DCHAS-L] OccHygPro: Chemical laboratory guidelines when working
>with Bromine...
>

>I=C4…m posting the question on behalf of a Canadian colleague. His direct

>e-mail is andrewcutz**At_Symbol_Here**hotmail.com
>
>- Ralph
>
>This is Andrew Cutz, CIH in Toronto, Canada. Would you be aware of any
>specific chemical laboratory guidelines when working with Bromine in
>combination with Aqua Regia? A client would like to inspect the
>chemical laboratory fume hood and associated mechanical exhaust system -
>addressing on-going occupant "bromine odour" complaints and concerns.
>Looks like that this is a pretty nasty (hazardous) stuff... not to be
>used by novices!
>
>Any guidance and potential leads would be much appreciated at this stage.
>
>Thank you in advance,
>
>Andrew Cutz
>
>Andrew Cutz (B.Sc., DIH, CIH, FAIHA ) | Managing Principal - Occupational
>Hygiene | Health+Safety Matters & Associates
>1 Pringle Avenue, Markham, Ontario, CANADA L3P 2P3
>Voice: (416) 895 7790 | Fax: (905) 209-1609 | eMail: 627788**At_Symbol_Here**ican.net
>| SKYPE : coxcutz
>LinkedIn Professional Profile:
>http://www.linkedin.com/in/1234andrewcutzandassociates
>
>
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