The foam insulation for our Multiprep arrived from the factory without any
holes in it. An oversight possibly?... If you're in the same boat, I
highly recommend punching 60 holes in the insulation. Using the insulation
won't hurt and the added temperature stability could help.
Georges L. Paradis
ICPMS Lab Manager
Department of Geological Sciences, Marine Science Institute
Unviversity of California Santa Barbara
Santa Barbara, CA 93106
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----- Original Message -----
From: "David Wheeler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, September 01, 2005 12:36 AM
Subject: [ISOGEOCHEM] Hydrogen by equilibration
> I've been trying to do hydrogen in water by equilibration on our PrismIII
> with a multiprep. I am having trouble getting consistantly good results.
> I have 4 questions.
> 1) Does anyone use the foam insulation on top of the sample holder? I'm
> finding it causes needles to bend.
> 2) What sort of needle do others use (diameter, type of tip)? Since I
> bent the needle I had been using for ages (for oxygen in water) I've had a
> lot of problems with the replacement needle clogging. It is getting a
> clear plastic (presumably Kel-F) in the tip of the needle.
> 3) What function does the Kel-F septum perform? Once the vial has been
> filled there is a hole in the Kel-F sepum which allows the gas to be in
> contact with the silicone septum.
> 4) Can you reuse the silicone rubber septa and how often? The manual
> says you can reuse them a few times but I'm beginning to wonder whether
> they are leaking.
> Any advice or insights will be most welcome.
> David Wheeler
> Professional Officer
> Geochemistry Laboratory School of Earth and Environmental Sciences
> University of Wollongong,
> Wollongong, 2522, NSW Australia
> Phone 02 4221 4586 (office)
> 02 4226 5903 (lab)
> Fax 02 4221 4250
> E-mail [log in to unmask]
> 'Oh no, we won't give in,
> we'll go living in the past'