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De : Stable Isotope Geochemistry [mailto:[log in to unmask]] De la part de Georges L. Paradis
Envoyé : 17 mai 2004 11:25
À : [log in to unmask]
Objet : [ISOGEOCHEM] low tech phosphoric acid question

From: [log in to unmask] href="mailto:[log in to unmask]">Georges L. Paradis

To: [log in to unmask] href="mailto:[log in to unmask]">[log in to unmask]

Sent: Monday, May 17, 2004 8:23 AM

Subject: low tech phosphoric acid question

I'm new to the isotope game and I'm having difficulties preparing 103% Phosphoric acid.  This may seem like a trivial question, but what is a good stir bar to use?   I've toasted a teflon stirbar and just this morning I broke a pyrex stirbar for the second time.  I was using VWR Spinbar Pyrex Stir Bars.  The setting was 150 rpm, which seems like very gentle stirring.  It may be that the temperature increase is expanding the gas inside the stirbar and the pressure is causing a breach in the pyrex. 

 

 Any suggestions would be greatly appreciated. 

 

Much Thanks,

Georges

 

 

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Georges L. Paradis
ICPMS Laboratory Manager
Department of Geological Sciences
University of California Santa Barbara
Santa Barbara, CA 93106
(805) 893-7182
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