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From: Pam Auburn <aubu**At_Symbol_Here**HOTMAIL.COM>
Subject: [DCHAS-L] Iodine clock reaction waste
Date: Thu, 10 Oct 2019 15:19:39 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: DM6PR06MB407502420E033995A6148170CC940**At_Symbol_Here**DM6PR06MB4075.namprd06.prod.outlook.com
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."
Is this still acceptable?
Thanks
Pamela Auburn, PhD
2041 Branard
Houston TX 77098
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