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Subject: Re: Laboratory eye protection, 2 responses
Date: Mon, 15 Sep 2003 08:42:28 -0400
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Subject: Re: New Chemistry Laboratories, 3 more replies
Date: Tue, 16 Sep 2003 07:22:34 -0400
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Date: Mon, 15 Sep 2003 14:42:54 -0700
Reply-To: "Larry D. McLouth" <ldmclouth**At_Symbol_Here**LBL.GOV>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Larry D. McLouth" <ldmclouth**At_Symbol_Here**LBL.GOV>
Organization: Lawrence Berkeley National Laboratory
Subject: Sodium Heat Transfer Pipe
Hi Everyone -

Maybe you can help me with an issue I'm dealing with.

We have a sodium heat transfer pipe that had formed a yellow crust
around one end.  One possibility is that the integrity of the pipe was
somehow breached and some sodium had gotten out - that's how it was
originally explained to me.

As you know sodium is grayish - but this material is yellow. I first
suspected either the per - or super oxide had somehow gotten formed -
though I don't know the environmental conditions the heat transfer pipe
was subjected to.   But sodium, unlike potassium doesn't readily form
oxides unless coaxed somewhat.  Another possibility is that the
hydroxide or carbonate was formed - but both of these are white in
appearance.   Any thoughts on what this yellowish material may be?

Also any thoughts on how to safely collect a sample for testing?  We
could do a peroxide or a pH test but this would first involve physically
removing a piece of the material and then subjecting it to aqueous
testing methods.

You can respond to me directly at ldmclouth**At_Symbol_Here**lbl.gov if you wish

Thanks

Larry

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