From: Lee Latimer <lhlatimer**At_Symbol_Here**MINDSPRING.COM>
Subject: Re: [DCHAS-L] Storing Pyrophoric/Water-Reactive Reagents at low temperature
Date: Wed, 18 Nov 2015 08:59:02 -0800
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: D271EE56.24AB1%lhlatimer**At_Symbol_Here**

Jenny, et al.,

As a former frequent user of alkyllithium reagents, this is a key issue.  The primary issue for users with storing t-BuLi and related compounds is the drop in titer with time.  This is best managed by using good technique with parafilm around the septum sealing the bottle.  

Catastrophic situations only happen when an outside agency like another bottle is “crashed” into the BuLi bottle (very rare exceptions could occur according to Prof. Murphy).  Thus, secondary containers are best at protecting from damage from other containers.  We used the metal cans the solutions arrived in frequently (after removal of the tops).  An individual secondary container for these solutions is always good practice rather than them sharing.  I would also recommend a wide enough base to increase stability when other items are being placed in the space.  Good practice would also take the secondary with the bottle to the location where it is clamped, in a perfect world.

Of course, good practice is managing the supply so bottles with low quantities are properly disposed of before problems arise (don’t let them collect).  I have not seen date labeling included in stock management, but it could be if you can get the users to cooperate.


On 11/18/15, 8:20 AM, "Debbie M. Decker" <dmdecker**At_Symbol_Here**UCDAVIS.EDU> wrote:

Okay – this is Debbie being nit-picky but I’m going to do it anyway because throwing around the wrong lingo drives me crazy.  And can cause you to spend a whole pile of money on the wrong type of refrigerator.
It’s not an “explosion-proof” refrigerator or freezer.  A true explosion-proof refrigerator is suitable for use when there’s a potentially explosive atmosphere both inside and OUTSIDE the refrigerator.  What you need is a flammable liquid storage refrigerator or “lab-safe” refrigerator.
Around here, pyrorphorics needing refrigeration are stored in flammable liquid storage refrigerators, in a dessicator or similar secondary containment..  It’s difficult to get pyrophorics completely segregated from flammables needing refrigeration which is why secondary containment becomes really important.
Hope this helps.
Debbie M. Decker, CCHO, ACS Fellow
Chair, Division of Chemical Health and Safety
University of California, Davis
dmdecker**At_Symbol_Here** <mailto:dmdecker**At_Symbol_Here**>
Birkett's hypothesis: "Any chemical reaction
that proceeds smoothly under normal conditions,
can proceed violently in the presence of an idiot."


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of TILAK CHANDRA
Sent: Wednesday, November 18, 2015 6:54 AM
Subject: Re: [DCHAS-L] Storing Pyrophoric/Water-Reactive Reagents at low temperature
Hi Jenny:
It is ok to store water sensitive reagents (pyrophorics too) inside an explosion proof refrigerator. Make sure your reagent bottle is under nitrogen atmosphere and cap is closed properly. You may also apply a Teflon tape around the cap and use a secondary containment inside refrigerators main compartment to avoid the sliding of the reagent bottle.
Good luck.

From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here** <mailto:dchas-l**At_Symbol_Here**> ] On Behalf Of Fu, Zhen
Sent: Tuesday, November 17, 2015 4:01 PM
Subject: [DCHAS-L] Storing Pyrophoric/Water-Reactive Reagents at low temperature

Hi All,
I read some Protocols for Safe Use of Pyrophoric/Water-Reactive Reagents mentioned “When refrigeration of materials is required, materials must be stored in an approved explosion-proof refrigerator/freezer.” As we all know, even the explosion-proof refrigerator/freezer cannot provide dry environment.
Can you share your experience on storing pyrophoric, flammable, and water-sensitive substances such as tBuLi solution in pentanes at low temperature? Great Thanks!


Best Regards,
Zhen (Jenny) Fu, Ph.D., Sr. Safety Specialist, Environmental Health & Life Safety
Administration & Finance / Dept. of Public Safety
University of Houston

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