From: Jeffrey Lewin <jclewin**At_Symbol_Here**MTU.EDU>
Subject: Re: [DCHAS-L] neutralizing ammonium sulfide
Date: Mon, 3 Aug 2020 08:27:43 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: CAEwQnqh+0MuzNwxqkbYfrmHUaTS2b+ke5hGS=z4tiqrraBn_Dw**At_Symbol_Here**mail.gmail.com
In-Reply-To


While writing it into the SOP is good practice, note that pH neutralization is one of the "treatment" processes specifically allowed under the federal rules. (your state may be more restrictive) There are caveats - you need to do the neutralization appropriately prior to disposal, you can can't treat other hazards, such as removing the ignitable characteristic from an ignitable/corrosive liquid, you need to assure, either through knowledge or testing other hazardous characteristics aren't present (no RCRA metals), and you need to meet the sewage discharge requirements of your POTW (publicly owned treatment works), which might have a more restrictive pH range than the national standard.

Jeff


On Sun, Aug 2, 2020 at 1:30 PM Denise Beautreau <deb313**At_Symbol_Here**lehigh.edu> wrote:
Monona is correct. If the the "neutralization" is not part of the process/reaction doing so after the fact is waste treatment and cannot be done without being licensed to do so. For example, students would do a Hess's Law experiment mixing HCl and sodium bicarbonate. At the end of the lab, I can "neutralize " the collected waste as that occurs secondarily as part of the experiment.

Denise

On Sunday, August 2, 2020, Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:
I think this is called waste treatment and not allowed without a license. Monona


-----Original Message-----
From: JOHN L STRAUGHN <0000120dde6ec15c-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Sent: Sun, Aug 2, 2020 05:34 AM
Subject: Re: [DCHAS-L] neutralizing ammonium sulfide


I'd try this: small scale, look for sulfur precipitation (may clear with further addition of peroxide), nitrogen gas bubbling and further NOx generation (red-brown fumes, ie. in a hood) possible. Get a recipie that works and share it in glory!

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of 00000eca7dd1d088-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU <00000eca7dd1d088-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Sent: Friday, July 31, 2020 12:06 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] neutralizing ammonium sulfide
You might look into adding hydrogen peroxide, perborate or some persulfate derivative.

Dan



-----Original Message-----
From: Nickie Norton <nnorton**At_Symbol_Here**SHEPCHEM.COM>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Fri, Jul 31, 2020 10:35 am
Subject: [DCHAS-L] neutralizing ammonium sulfide

Hi All,
We are using ammonium sulfide in excess in a reaction in water. What is the proper way to dispose of the aqueous ammonium sulfide? We are concerned that if we add bleach we will make chloramine. Does anyone have a way to convert the ammonium sulfide to ammonium sulfate?
Thank you,
Nickie Norton
Research Chemist
The Shepherd Chemical Company
513-842-9332
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