DCHAS-L Archives, Jul 3, 2024 - Re: [DCHAS-L] Methylene chloride in teaching labs

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Subject: Re: [DCHAS-L] Methylene chloride in teaching labs

Date: Jul 3, 2024 17:07 UTC

Author: Kristi Ohr <kohr**At_Symbol_Here**UMASS.EDU>

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Subject: Re: [DCHAS-L] LSI Free Webinar on DCM Regulations

Date: Jul 3, 2024 20:03 UTC

Author: Jack Brown <orgchem1954**At_Symbol_Here**GMAIL.COM>

From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

Subject: Re: [DCHAS-L] Methylene chloride in teaching labs

Date: Jul 3, 2024 19:46 UTC

Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>

Message-ID: <485757396.451431.1720035969820**At_Symbol_Here**mail.yahoo.com>

In-Reply-To: <CAEiU9vAapw+iMXzebP8z=kpW9RaN1H=E--POcs3iaxUWw8tg+w**At_Symbol_Here**mail.gmail.com>

Just thought you might like to know about the other ECELs that are either set or soon to be set: And see how far from the old standards they are.

SUBSTANCE       ECEL-TWA   ECEL STEL   OSHA PEL-TWA
Asbestos                      0.005   f/cc            0.1 f/cc
Methylene cloride       2          ppm       16 ppm          25 ppm
Trichloroethylene        0.0011 ppm               10 ppm
Perchloroethylene       0.14     ppm           100 ppm
Carbon Tetrachloride   0.03 ppm                      10 ppm

And one for N-methyl pyrrolidone is being set

Monona

On Wednesday, July 3, 2024 at 11:25:08 AM EDT, Jonathan Dannatt <jdannatt**At_Symbol_Here**udallas.edu> wrote:

Hey Alex,

We have removed it from all of our teaching labs, even the upper level ones to avoid this question and issue. I look forward to the discussion. We are also trying to figure out the best way to perform the monitoring of DCM which is required before May 5, 2025.

Warmest regards,

Jonathan

On Wed, Jul 3, 2024 at 9:58 AM Alex Hagen <fischera**At_Symbol_Here**uw.edu> wrote:

Good afternoon,

Like many others, our institution is currently trying to assess the impacts of the new methylene chloride regulation from EPA, and a question has come up around use of this chemical in teaching labs. Our chemistry department currently uses methylene chloride for some of their higher level courses. Do activities with methylene chloride conducted in teaching labs qualify as “commercial use as a laboratory chemical”?

How is your institution addressing this issue (if it is relevant for you)?

Any input is appreciated!

Regards,
~Alex

ALEX HAGEN, CCHO

Laboratory Safety Inspection Program Manager

Environmental Health & Safety Department

fischera**At_Symbol_Here**uw.edu / www.ehs.washington.edu

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