I would love to know the history, thanks! -Jo

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of "rphifer**At_Symbol_Here**WCENVIRONMENTAL.COM" <rphifer**At_Symbol_Here**WCENVIRONMENTAL.COM>
Organization: WC Environmental, LLC
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Date: Friday, October 11, 2019 at 2:21 PM
To: "DCHAS-L**At_Symbol_Here**PRINCETON.EDU" <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: Re: [DCHAS-L] Iodine clock reaction waste

The responses I've seen to this question are technically correct; it is certainly best to make it part of the procedure if you're going to "treat" the by-product prior to declaring it a waste. However, treatment in an accumulation container is allowed under RCRA. The reference is 51FR 10168, March 24, 1986. There are two conditions - the container must be kept closed except when adding or subtracting waste, and accumulation standards apply for time limits and container management.

In other words, it may be legal to treat the hazardous byproducts from a lab experiment in a satellite accumulation area as part of the waste accumulation process. You would need to consider compatibility with any other substances being accumulated in the waste "container", which in this case might be a reaction vessel.

I'd be glad to go into the history of why this rule exists if anyone cares.

Russ

Russ Phifer

WC Environmental, LLC
1085C Andrew Drive

West Chester, PA 19380

610-322-0657

rphifer**At_Symbol_Here**wcenvironmental.com

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of James Saccardo
Sent: Friday, October 11, 2019 2:02 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Iodine clock reaction waste

Ann,

Pam is right, if the material is declared a waste and then you add thiosulfate, it is considered treatment of hazardous waste (oxidizing - EPA D001) to remove the hazardous characteristic and you permit to perform such treatment. Thiosulfate is a reducing agent in this case.

However, if the students add the thiosulfate as part of the last step in the experiment and then add it to the waste container, the waste should not have any hazardous characteristics or EPA listed constituents and can be managed as non-hazardous waste (assuming the pH is between 5 and 9).

Of course you need to consider the volume, your municipal water regulations, municipal waste water treatment methods, and ultimate fate.

Perhaps setting up a profile with your TSDF and direct shipping the waste in large volume containers (5 to 16 gallon DOT rated drums) - the cost might be much less than you expect (vs. the cost of thiosulfate) and environmentally sound.

Be well,

James

From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Wagoner, Jo
Sent: Friday, October 11, 2019 1:31 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Iodine clock reaction waste

Hi Pamela.

We looked into this process in the past, and found out that unless you have a license to treat waste, you cannot do this unless it is part of the lab experiment itself.

-Jo

Jo Wagoner

Stockroom Coordinator

Butler University

Department of Chemistry & Biochemistry

4600 Sunset Ave., GH300A

Indianapolis, IN 46208

Office 317-940-9972

NAOSMM Safety Committee Chair

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of "Klotz, Ann" <klotz**At_Symbol_Here**SIENA.EDU>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Date: Friday, October 11, 2019 at 8:18 AM
To: "DCHAS-L**At_Symbol_Here**PRINCETON.EDU" <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: Re: [DCHAS-L] Iodine clock reaction waste

Pamela,

Any drain disposal of chemicals should be evaluated by your local water authority.

Ann

On Thu, Oct 10, 2019 at 11:49 AM Pam Auburn <aubu**At_Symbol_Here**hotmail.com> wrote:

I was wondering if anyone here has experience with this reaction and the proper waste disposal

IO₃^- + 3 HSO₃^- --> I^- + 3 SO₄^-2 + 3 H⁺

IO₃^- = 8 I^- + 6 H⁺ --> 3 I₃^- + 3 H₂O

I₃^- + HSO₃^- + H₂O --> 3 I^- + SO₄^-2 + 3 H⁺

2 I₃^- + starch --> starch-I₅^- complex (blue)

I saw from something published in 1996 "For disposal of waste products, combined all of the solutions used in this experiment with solid sodium thiosulfate until the mixture is no longer blue. The resulting clear mixture can then be discarded by flushing down the drain upon the addition of water."

Mitchell, R.S. Iodine Clock Reaction. J. Chem. Educ., 1996, 73 (8), 783.

Is this still acceptable?

Thanks

Pamela Auburn, PhD

2041 Branard

Houston TX 77098

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