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Previous by Date: Subject: Re: [DCHAS-L] Silica gel dispensing (Was: Toxic dust handling) Date: June 26, 2012 6:37:02 PM EDT Author: Bruce Van Scoy |
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From: DCHAS-L Discussion
List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Bruce Van Scoy
Sent: Tuesday, June 26, 2012 3:37 PM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: Re: [DCHAS-L] Silica gel dispensing (Was: Toxic dust handling)
You may want to check a Flow Sciences Bulk Powder Handling
Ventilated Safety Enclosure. Essentially the drum is lifted up through a
rubber flange built into the base of the cabinet, so the top just breaks the
enclosures base/bottom surface. All particulates generated during
dispensing are exhausted through two HEPA filters prior to the final exhausted
air removal by a house exhaust system.
BruceV
From: DCHAS-L Discussion
List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of ILPI
Sent: Tuesday, June 26, 2012 4:11 PM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Silica gel dispensing (Was: Toxic dust handling)
By an interesting coincidence, I received this query from a
colleague today. A very similar question to the earlier one on dusts.
Anyone have handling advice? Thanks, Rob Toreki
The group buys silica gel in big drums. These are
stored in our storage room. They are too tall to use in our fume hoods.
When the students need to fill up their individual jars (2 L or so) they
come in, put on a dust mask and fill their jars. As you might
expect, a thin coating of silica dust ends up everywhere and builds up
over time. We've just had the storage room renovated, and I'd like
to avoid it reverting to a silica pit, especially since we may be putting
a drybox in there. Are you aware of any commercial dispensers or containment
units which would allow us to dispense silica into jars while keeping the
inevitable dust cloud contained?
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-----Original Message-----
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU]
On Behalf Of Ralph B Stuart
Sent: Tuesday, June 26, 2012 9:42 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Toxic dust handling
A question has arisen here about the best practices for handling dusts known to
be unusually toxic, such as teratogens or mutagens. It appears from google
searches that many academic Standard Operating Procedures recommend using these
dusts in a fume hood. This seems counter-intuitive to me, as strong air flows
around these dusts would seem to create a housekeeping challenge by dispersing
the dust around the use area. This could lead to unnecessary contamination of
someone's hands as they work with the material. In addition, the ergonomics of
performing delicate operations, such as handling dusts, in a hood can be a
challenge due to their one size fits all nature.
Prudent Practices indicates that highly toxic dusts should be used in a hood,
but that seems to be rolled up in the same recommendation as for handling gases
and vapors. It seems to me that dusts present distinct hygiene challenges from
gases and vapors. I wonder if anyone has addressed this issue with specific
rules that distinguish between these kinds of chemicals?
Thanks for any information about this.
- Ralph
Ralph Stuart CIH
Laboratory Ventilation Specialist
Department of Environmental Health and Safety Cornell University
rstuart**At_Symbol_Here**cornell.edu
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