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Subject: Re: [DCHAS-L] Acid and Base (glass wash) Bath Containers
Date: Monday, December 2, 2019 at 3:46:59 PM
Author: "Jeffrey Your, CSMM" <00000506835eb4f7-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> 		Next by Date:
Subject: Re: [DCHAS-L] Acid and Base (glass wash) Bath Containers
Date: Mon, 2 Dec 2019 21:01:27 +0000
Author: Benjamin Chew

From: Craig Merlic <merlic**At_Symbol_Here**CHEM.UCLA.EDU>
Subject: Re: [DCHAS-L] Acid and Base (glass wash) Bath Containers
Date: Mon, 2 Dec 2019 13:00:56 -0800
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 610281C6-0CD0-4272-9396-D748282B1793**At_Symbol_Here**chem.ucla.edu
In-Reply-To


Kimi,

 

My research group has used IPA/KOH in plastic buckets as cleaning baths for 30 years without an incident. They can be placed in a Nalgene tub to address potential spills and drips.

 

It is important to note that these are CLEANING baths. Hence all the contents of the glass reaction flasks should be removed and dealth with properly as the normal part of a reaction workup. Only a minimal amount of residue should be removed in the base bath, so pressurization (due to residues decomposing) is not an issue.

 

Some research groups use acid baths to treat glassware after it is cleaned in a base bath. So there never would be a pressuriaztiuon issue since there would be no residues.

 

Best,

Craig

 

Craig A. Merlic

Professor of Chemistry, UCLA Department of Chemistry and Biochemistry

Executive Director , UC Center for Laboratory Safety

http://cls.ucla.edu

Los Angeles, CA  90095-1569

Voice:  310-825-5466

 

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of "Jeffrey Your, CSMM" <00000506835eb4f7-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Date: Monday, December 2, 2019 at 12:48 PM
To: <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: Re: [DCHAS-L] Acid and Base (glass wash) Bath Containers

 

Kimi,

I use a five gallon pail with a screw top for our KOH IPA base bath.  Pressurization has not been a problem over the years.

 

On Mon, Dec 2, 2019 at 2:52 PM Brown, Kimberly Jean <kimibush**At_Symbol_Here**ehrs.upenn.edu> wrote:

Hello, and Happy December!

Have any of you issued (or been subject to) specific guidance regarding lab-scale acid and bath baths for glassware cleaning? 

After some recent spills, we evaluated the types of containers being used for acid and base baths in our labs.  Some groups are using 5-gallon buckets with poorly fitting lids, which is what led to the spills.  In updating our recommendations, however, we questioned whether or not the lids should be tight-fitting (liquid/gas tight) due to the potential for pressurization.

Ultimately, we recommended a product such as this:  https://www.calpaclab.com/nalgene-rectangular-tank-with-cover-pp-7-gal-12x12x12/ng-14200-0010# (Which more than a few groups resisted/rejected for a variety of reasons).

A researcher argued that there is no potential for pressurization of a base bath (e.g. KOH and IPA) during glassware soaking, and therefore, a bucket with a screw top lid should still be an acceptable option.

Thoughts?  Is there a potential for pressurization of the base bath?  What requirements, if any, do you have for this?

Thanks for sharing your experiences and opinions!

Kimi Brown

(Kimi Bush) (she, her, hers)

Sr. Lab Safety Specialist

Environmental Health and Radiation Safety

University of Pennsylvania

3160 Chestnut St., Suite 400

Philadelphia, PA 19104-6287

Office: 215-746-6549

Voice/cell/text:  215-651-0557 

fax: 215-898-0140

 

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Jeff                           
 Jeffrey A. Your, M.B.A., C.S.M.M. - Science Buyer  
 Manager, Central Scientific Stores and Laboratory Support Services  

 Chair, University Sustainability Committee

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 John Carroll University                               
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