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
Pamela,
Any drain disposal of chemicals should be evaluated by your local water authority.
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?
2041 Branard
Houston TX 77098
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