There are 5 messages totaling 1489 lines in this issue.

Topics of the day:

  1. How should DCM be handled in a chemical hygiene plan? (3)
  2. ICYMI - Proposal to shut down the CSB (2)

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Date:    Tue, 22 Jul 2025 20:28:58 +0000
From:    James Saccardo <James.Saccardo**At_Symbol_Here**CSI.CUNY.EDU>
Subject: Re: How should DCM be handled in a chemical hygiene plan?

John,
Waste is the least of your worries. You CHP should state no procurement without prior approval. Your CHP can also refer to MeCl  (workplace chemical protection plan) WCPP if you have one.
Anyone using methylene chloride must perform initial monitoring to determine employee exposure levels. If you do not exceed the 2ppm level 8 hr TWA, you don’t need to have a WCPP, but is prudent to have one that lays out periodic monitoring requirements, storage and use locations.
If using in a laboratory fume hood correctly, I can’t imagine exceeding the limits of the TSCA rule

There are a few other caveats, like demarking the work areas, restricted access when in use, but anyone possessing and using MeCl must follow the EPA TSCA 2024 final rule.

As for your initial question, you should check with your TSDF end facility and see what their requirements are for waste containing MeCl. Anyone handing waste may also need to be monitored for exposure levels.

Finally, some have been using 1,2-dichloroethne as an alternative solvent but are not as pleased with the performance in their work ups as with MeCl. This may be good for commerce, but it hurts basic research. Please let the list know if you have any good MeCl monitoring techniques, vendors, or alternatives to MeCl.
Best,
James

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Jonathan Dannatt
Sent: Monday, July 21, 2025 10:43 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] How should DCM be handled in a chemical hygiene plan?


* This email originates from a sender outside of CUNY. Verify the sender before replying or clicking on links and attachments. *
Hey all,

We are updating our chemical hygiene plan and were wondering if you all could provide some guidance on how DCM should be written in the plan. We have a category for halogenated wastes, but with the new rules do we need to separate halogenated waste from DCM? Do we need to include more language about measuring exposure, etc?

Thank you for any help you can provide.

Warmest regards,
Jonathan


--

Jonathan Dannatt, Ph.D.
Associate Professor
Department of Chemistry
University of Dallas
O: (972) 721-5065
E: jdannatt**At_Symbol_Here**udallas.edu<mailto:jdannatt**At_Symbol_Here**udallas.edu>
W: Website<https://urldefense.com/v3/__https:/udallas.edu/constantin/academics/programs/chemistry/faculty/dannatt_jonathan.php__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yJjBzC5h$>, Linkedin<https://urldefense.com/v3/__https:/www.linkedin.com/in/jonathan-dannatt/__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yDE_mWJ1$>


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------------------------------

Date:    Wed, 23 Jul 2025 08:48:53 -0400
From:    Jessica Martin <jmartin54321**At_Symbol_Here**GMAIL.COM>
Subject: Re: How should DCM be handled in a chemical hygiene plan?

I’ll add to what James said here. As we have been doing monitoring at my institution, a few things have come up regarding handling that it is good to make sure you are watching for.

While we did have researchers who were “using DCM in the hood”, they were also doing things like (i) filling a smaller container from a larger container of DCM outside of hoods, (ii) even if the filling was happening inside of a hood, the researcher would then walk the open beaker over to a different hood (hence outside of the hood), (iii) we would have researchers walk DCM over to a waste container that wasn’t in a hood.

While none of these practices in isolation gave us problematic reads, added together they start to look like you are getting close to limits of exposure - or tipping just over. So as you are working through best practices with researchers, just be mindful of these smaller things that some folks may not think of when they think about “working with DCM in the hood.” With some minor adjustments to some of the practices above, we were able to get DCM monitoring results well under the limits.

Jessica A. Martin, Ph.D.
323-327-3974
jmartin54321**At_Symbol_Here**gmail.com

bottomlinetech, Inc <https:​//bottomlinetech.com/> | LinkedIn <https://www.linkedin.com/in/jessicaannemartin/> | ORCiD <https://orcid.org/0000-0002-4083-0848>

The opposite of war isn’t peace, it is creation.

Starting a podcast about Lab Training!

If you are passionate about any aspects of lab training, check out the trailer for Skilled, Safe, and Trailblazing <https://open.spotify.com/show/6aQT9duH9xfvWMLI2E0frW>, my new podcast (launching content in July), and follow the LinkedIn page <https://www.linkedin.com/showcase/skilled-safe-and-trailblazing/> for the community for updates.

ACS CHAS PEER-LED WORKSHOPS

The Workshop ACS CHAS Empowering Academic Researchers to Strengthen Safety Culture is being held next on Sunday, March 16, 2025, 2 PM to 5:30 PM Eastern Time online!
To learn more and to register, please follow this link: https://www.eventbrite.com/e/acs-chas-empowering-academic-researchers-to-strengthen-safety-culture-tickets-1206069068049?aff=oddtdtcreator

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> On Jul 22, 2025, at 4:28 PM, James Saccardo <James.Saccardo**At_Symbol_Here**CSI.CUNY.EDU> wrote:
>
> John,
> Waste is the least of your worries. You CHP should state no procurement without prior approval. Your CHP can also refer to MeCl  (workplace chemical protection plan) WCPP if you have one.
> Anyone using methylene chloride must perform initial monitoring to determine employee exposure levels. If you do not exceed the 2ppm level 8 hr TWA, you don’t need to have a WCPP, but is prudent to have one that lays out periodic monitoring requirements, storage and use locations.
> If using in a laboratory fume hood correctly, I can’t imagine exceeding the limits of the TSCA rule
> 
> There are a few other caveats, like demarking the work areas, restricted access when in use, but anyone possessing and using MeCl must follow the EPA TSCA 2024 final rule.
> 
> As for your initial question, you should check with your TSDF end facility and see what their requirements are for waste containing MeCl. Anyone handing waste may also need to be monitored for exposure levels.
> 
> Finally, some have been using 1,2-dichloroethne as an alternative solvent but are not as pleased with the performance in their work ups as with MeCl. This may be good for commerce, but it hurts basic research. Please let the list know if you have any good MeCl monitoring techniques, vendors, or alternatives to MeCl.
> Best,
> James
> 
> From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU <mailto:DCHAS-L**At_Symbol_Here**Princeton.EDU>> On Behalf Of Jonathan Dannatt
> Sent: Monday, July 21, 2025 10:43 AM
> To: DCHAS-L**At_Symbol_Here**Princeton.EDU <mailto:DCHAS-L**At_Symbol_Here**Princeton.EDU>
> Subject: [DCHAS-L] How should DCM be handled in a chemical hygiene plan?
> 
> * This email originates from a sender outside of CUNY. Verify the sender before replying or clicking on links and attachments. *
>
> Hey all, 
> 
> We are updating our chemical hygiene plan and were wondering if you all could provide some guidance on how DCM should be written in the plan. We have a category for halogenated wastes, but with the new rules do we need to separate halogenated waste from DCM? Do we need to include more language about measuring exposure, etc?
> 
> Thank you for any help you can provide.
> 
> Warmest regards,
> Jonathan
>
> 
> --
> Jonathan Dannatt, Ph.D.
> Associate Professor
> Department of Chemistry
> University of Dallas
> O: (972) 721-5065
> E: jdannatt**At_Symbol_Here**udallas.edu <mailto:jdannatt**At_Symbol_Here**udallas.edu>
> W: Website <https://urldefense.com/v3/__https:/udallas.edu/constantin/academics/programs/chemistry/faculty/dannatt_jonathan.php__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yJjBzC5h$>, Linkedin <https://urldefense.com/v3/__https:/www.linkedin.com/in/jonathan-dannatt/__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yDE_mWJ1$>
>
> 
> --- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair atmembership**At_Symbol_Here**dchas.org <mailto:membership**At_Symbol_Here**dchas.org>--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org <mailto:membership**At_Symbol_Here**dchas.org>

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------------------------------

Date:    Wed, 23 Jul 2025 09:01:50 -0500
From:    Jonathan Dannatt <jdannatt**At_Symbol_Here**UDALLAS.EDU>
Subject: Re: How should DCM be handled in a chemical hygiene plan?

Hey Jessica,

Thank you. Your comments here are really helpful. I'm curious about what
you've seen regarding solvent removal of DCM, for example, after a reaction
it is pretty common to rotovap the reaction mixture to remove the solvent.

Warmest regards,
Jonathan



On Wed, Jul 23, 2025 at 8:22 AM Jessica Martin <jmartin54321**At_Symbol_Here**gmail.com>
wrote:

> I’ll add to what James said here. As we have been doing monitoring at my
> institution, a few things have come up regarding handling that it is good
> to make sure you are watching for.
>
> While we did have researchers who were “using DCM in the hood”, they were
> also doing things like (i) filling a smaller container from a larger
> container of DCM outside of hoods, (ii) even if the filling was happening
> inside of a hood, the researcher would then walk the open beaker over to a
> different hood (hence outside of the hood), (iii) we would have researchers
> walk DCM over to a waste container that wasn’t in a hood.
>
> While none of these practices in isolation gave us problematic reads,
> added together they start to look like you are getting close to limits of
> exposure - or tipping just over. So as you are working through best
> practices with researchers, just be mindful of these smaller things that
> some folks may not think of when they think about “working with DCM in the
> hood.” With some minor adjustments to some of the practices above, we were
> able to get DCM monitoring results well under the limits.
>
> Jessica A. Martin, Ph.D.
> 323-327-3974
> jmartin54321**At_Symbol_Here**gmail.com
>
> bottomlinetech, Inc <https:​//bottomlinetech.com/> | LinkedIn
> <https://www.linkedin.com/in/jessicaannemartin/> | ORCiD
> <https://orcid.org/0000-0002-4083-0848>
>
> *The opposite of war isn’t peace, it is creation.*
>
> *Starting a podcast about Lab Training!*
>
> If you are passionate about any aspects of lab training, check out the
> trailer for *Skilled, Safe, and Trailblazing*
> <https://open.spotify.com/show/6aQT9duH9xfvWMLI2E0frW>, my new podcast
> (launching content in July), and follow the LinkedIn page
> <https://www.linkedin.com/showcase/skilled-safe-and-trailblazing/> for
> the community for updates.
>
> *ACS CHAS PEER-LED WORKSHOPS*
>
> The Workshop ACS CHAS Empowering Academic Researchers to Strengthen Safety
> Culture is being held next on *Sunday, March 16, 2025, 2 PM to 5:30 PM
> Eastern Time* online!
> To learn more and to register, please follow this link:
> https://www.eventbrite.com/e/acs-chas-empowering-academic-researchers-to-strengthen-safety-culture-tickets-1206069068049?aff=oddtdtcreator
>
> The Workshop ACS CHAS RAMP in the Research Lab is being held next on
> *TBD *online!
> To learn more and to register, please follow this link:
> https://www.eventbrite.com/e/acs-chas-ramp-in-the-research-lab-tickets-1084192863039?aff=oddtdtcreator
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Jul 22, 2025, at 4:28 PM, James Saccardo <James.Saccardo**At_Symbol_Here**CSI.CUNY.EDU>
> wrote:
>
> John,
> Waste is the least of your worries. You CHP should state no procurement
> without prior approval. Your CHP can also refer to MeCl  (workplace
> chemical protection plan) WCPP if you have one.
> Anyone using methylene chloride must perform initial monitoring to
> determine employee exposure levels. If you do not exceed the 2ppm level 8
> hr TWA, you don’t need to have a WCPP, but is prudent to have one that lays
> out periodic monitoring requirements, storage and use locations.
> If using in a laboratory fume hood correctly, I can’t imagine exceeding
> the limits of the TSCA rule
>
> There are a few other caveats, like demarking the work areas, restricted
> access when in use, but anyone possessing and using MeCl must follow the
> EPA TSCA 2024 final rule.
>
> As for your initial question, you should check with your TSDF end facility
> and see what their requirements are for waste containing MeCl. Anyone
> handing waste may also need to be monitored for exposure levels.
>
> Finally, some have been using 1,2-dichloroethne as an alternative solvent
> but are not as pleased with the performance in their work ups as with MeCl.
> This may be good for commerce, but it hurts basic research. Please let the
> list know if you have any good MeCl monitoring techniques, vendors, or
> alternatives to MeCl.
> Best,
> James
>
> *From:* ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
>  *On Behalf Of *Jonathan Dannatt
> *Sent:* Monday, July 21, 2025 10:43 AM
> *To:* DCHAS-L**At_Symbol_Here**Princeton.EDU
> *Subject:* [DCHAS-L] How should DCM be handled in a chemical hygiene plan?
>
>
> ** This email originates from a sender outside of CUNY. Verify the sender
> before replying or clicking on links and attachments. **
> Hey all,
>
> We are updating our chemical hygiene plan and were wondering if you all
> could provide some guidance on how DCM should be written in the plan. We
> have a category for halogenated wastes, but with the new rules do we need
> to separate halogenated waste from DCM? Do we need to include more language
> about measuring exposure, etc?
>
> Thank you for any help you can provide.
>
> Warmest regards,
> Jonathan
>
>
> --
> *Jonathan Dannatt, Ph.D.*
> Associate Professor
> Department of Chemistry
> University of Dallas
> *O*: (972) 721-5065
> *E*: jdannatt**At_Symbol_Here**udallas.edu
> *W*: Website
> <https://urldefense.com/v3/__https:/udallas.edu/constantin/academics/programs/chemistry/faculty/dannatt_jonathan.php__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yJjBzC5h$>
> , Linkedin
> <https://urldefense.com/v3/__https:/www.linkedin.com/in/jonathan-dannatt/__;!!Jg5O23S-og4!4bxC8V-EsCeqk6Jddf-lPPeKKXZuJMrx-HCt90RNULdKQywvg6wvDEtV4XvzRzMYCCFw1LKWn1YYLpGl07q7yDE_mWJ1$>
>
>
> --- For more information about the DCHAS-L e-mail list, contact the
> Divisional membership chair atmembership**At_Symbol_Here**dchas.org
> --- For more information about the DCHAS-L e-mail list, contact the
> Divisional membership chair at membership**At_Symbol_Here**dchas.org
>
>
> --- For more information about the DCHAS-L e-mail list, contact the
> Divisional membership chair at membership**At_Symbol_Here**dchas.org

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------------------------------

Date:    Wed, 23 Jul 2025 10:50:05 -0500
From:    Frankie Wood-Black <fwoodblack90**At_Symbol_Here**GMAIL.COM>
Subject: ICYMI - Proposal to shut down the CSB

https://www.washingtonpost.com/climate-environment/2025/06/03/chemical-safety-board-trump-budget/



*Frankie Wood-Black, Ph.D., REM, MBA*
*ACS Fellow, AAAS Fellow*
*Principal - Sophic Pursuits*
*NOTE - ADDRESS CHANGE - Mailing Address - PO Box 433, Tonkawa, OK 74653*

*email address fwoodblack90**At_Symbol_Here**gmail.com <fwoodblack**At_Symbol_Here**gmail.com>*
*or fwblack**At_Symbol_Here**sophicpursuits.com <fwblack**At_Symbol_Here**sophicpursuits.com>*

*580-761-3703*

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Date:    Wed, 23 Jul 2025 19:29:36 +0000
From:    "Leach, Patricia" <Patricia.Leach**At_Symbol_Here**UTDALLAS.EDU>
Subject: Re: ICYMI - Proposal to shut down the CSB

I wonder if the NTSB is next.

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Frankie Wood-Black
Sent: Wednesday, July 23, 2025 10:50 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] ICYMI - Proposal to shut down the CSB

https://www.washingtonpost.com/climate-environment/2025/06/03/chemical-safety-board-trump-budget/



Frankie Wood-Black, Ph.D., REM, MBA
ACS Fellow, AAAS Fellow
Principal - Sophic Pursuits
NOTE - ADDRESS CHANGE - Mailing Address - PO Box 433, Tonkawa, OK 74653

email address fwoodblack90**At_Symbol_Here**gmail.com<mailto:fwoodblack**At_Symbol_Here**gmail.com>
or fwblack**At_Symbol_Here**sophicpursuits.com<mailto:fwblack**At_Symbol_Here**sophicpursuits.com>

580-761-3703
--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org<mailto:membership**At_Symbol_Here**dchas.org>

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End of DCHAS-L Digest - 22 Jul 2025 to 23 Jul 2025 (#2025-84)
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