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
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For more information about the list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org