From: Sandra K Koster <skoster**At_Symbol_Here**UWLAX.EDU>
Subject: Re: [DCHAS-L] HPLC solvent disposal
Date: Tue, 4 Oct 2016 21:05:15 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: CO2PR03MB23603BF97B222FA5490436C2B0C50**At_Symbol_Here**CO2PR03MB2360.namprd03.prod.outlook.com
In-Reply-To <94b46b6b-8414-d412-37c0-284b31fe6ba1**At_Symbol_Here**well.com>


Ethyl acetate would reduce the acidity of the solution by diluting the trifluoroacetic acid but upon hydrolysis the ethyl acetate should give acetic acid and ethanol.  The acetic acid is an acid as its name implies so it should not reduce acidity.  Is there something I am missing? 


Sandra Koster

University of Wisconsin-La Crosse


From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of davivid <davivid**At_Symbol_Here**WELL.COM>
Sent: Tuesday, October 4, 2016 2:54:12 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] HPLC solvent disposal
 
The mixture is likely corrosive as well as flammable. Adding ethyl
acetate to an aqueous flammable/corrosive mixture will bring the pH into
the non-corrosive range given time for hydrolysis to occur.

Dave

On 4/10/16 11:40 AM, Jerome J King wrote:
> Laurie:
>
> Like John indicated, I also work in a production laboratory and we drum all our HPLC waste for removal by a licensed waste hauler.
>
> Jerry King
>
> Jerome King | Technical Director
> 13611 B Street Omaha, NE 68144
> Office 402-829-9890 Cell 402-658-5005
> email | map | website
>
>
> From: "Hung" <000003225480afd0-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Sent: Tuesday, October 4, 2016 1:25:05 PM
> Subject: Re: [DCHAS-L] HPLC solvent disposal
>
>
>
> Hello Laurie,
>
> My experience is that it is never okay to dump chemicals into the sink.. I work in a production lab and we currently put all hplc waste in a grounded 55 gallon drums and an approved waste company pick it up to dispose it properly. By law we don't have the authority to treat wastes like waste companies do. I hope this helps.
>
> John Nguyen
>
>
> On Oct 4, 2016 11:59 AM, Laurie Yoder <laurie.yoder**At_Symbol_Here**EMU.EDU> wrote:
>
>
>
>
>>
>
>
>
>
>> We have a research group that wants to begin a HPLC project using tetrafluoroacetic acid/acetonitrile mix (diluted to 40% in water) as the solvent. The student working on the project has used this procedure at another institution and said they dumped the waste solvent down the drain. Really? I thought this would still have some characteristic hazard. Does anyone else have experience with this mixture, and how do you dispose of it properly?
>>
>> --
>> Laurie M. Yoder
>> Assistant Professor of Chemistry and Chemical Hygiene Officer
>> Eastern Mennonite University
>> 1200 Park Road
>> Harrisonburg, VA 22802
>> --- This e-mail is from DCHAS-L, the e-mail list of the ACS Division of Chemical Health and Safety. For more information about the list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org
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