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| Date: | Thu, 1 Sep 2005 08:37:19 -0500 |
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Hi David,
We do use the foam insulation, but have punched out small holes
(~0.8cm) at each vial position to give the needle a clear path to the
vial. We use the Aquaprep needle from GV. So far no clogging
problems, but we don't use the Kel-F's when running H. We've been
getting good results using the Labco vials with the gray septa. I
also use this type of vial (without Kel-F's) for CO2 analysis using
our Microgas. The only time we use Kel-F's (and the blue silicone
septa) is when we are analyzing carbonates using the Mulitcarb.
Lastly, we do not reuse the septa (either the gray ones or the blue
silicone ones).
I hope this helps.
Jennifer
>Hello,
>
>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.
>
>cheers,
>David
>
>內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻
>
>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'
>
>內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻內躬內躬偕爻
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Jennifer Mckay
Agente de Recherche / Research Associate
GEOTOP - Universite du Quebec a Montreal
C.P. 8888, succursale Centre-Ville
Montreal, Quebec, Canada
H3C 3P8
Telephone bureau/office: 514-987-3000 (poste/ext 2413)
Telephone lab: 514-987-3000 (poste/ext 7028)
Telephone GEOTOP: 514-987-4080
Telecopieur/Fax: 514-987-3635
E-mail: [log in to unmask] or if that fails try [log in to unmask]
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