Date: Wed, 11 Aug 2010 12:46:50 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: tanis.marquette**At_Symbol_Here**HEXION.COM
Subject: Re: Old Formalin With Lots of Precipitate

The paraformaldehyde has settled out.


  From: Dan Blunk [blunk**At_Symbol_Here**UCSC.EDU]
  Sent: 08/11/2010 10:28 AM MST
  To: DCHAS-L**At_Symbol_Here**LIST.UVM.ED U
  Subject: [DCHAS-L] Old Formalin With Lots of Precipitate


Colleagues,

I wondered if you’ve run into this previously:

A physical plant person brought me a pint reagent bottle labeled 37% Formaldehy de this morning that he found while remodeling a workspace.

The bottle is the original Mallinckr odt AR bottle.< /font>

It’s about =C2=BE full, and appears to have been opened.< /p>

About 50% of the volume of the bottle is a white precipitate, with about =C2=BC vol ume of clear liquid above.

The purchase date on the label is smudged, but it appears the bottle is at least 35 years old.

As I remember, aldehydes do undergo a slow polymerization reaction. I wouldn’ ;t expect an aqueous solution to form peroxides.

Thoughts?

 

Dan

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