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Subject: [DCHAS-L] Chemical Safety headlines (20 articles)
Date: Friday, October 11, 2019 at 7:47:30 AM
Author: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG> 		Next by Date:
Subject: [DCHAS-L] New ACS Resource to Help Assess Safety of Chemical Demonstrations and Videos
Date: Fri, 11 Oct 2019 08:21:36 -0400
Author: Ralph Stuart

From: "Klotz, Ann" <klotz**At_Symbol_Here**SIENA.EDU>
Subject: Re: [DCHAS-L] Iodine clock reaction waste
Date: Fri, 11 Oct 2019 08:16:49 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: CANOW4ca7Nckxq8x05obkHGH9B+57-h-L+hDEfUE59DrmErCPRQ**At_Symbol_Here**mail.gmail.com
In-Reply-To


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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Ann Klotz
School of Science
Siena College
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Loudonville, NY 12211-1462

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