Stable Isotope Geochemistry


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Stable Isotope Geochemistry <[log in to unmask]>
Wed, 22 Jun 2005 14:30:20 -0600
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Those very same vials (Wheaton V-shaped vial, part# 986284) are the ones I
had problems with the elusive 'trapped bubbles'.

Regarding their ability to fit in the 60 heated rack for the Multiflow
(installed 2 years ago): one problem I did not expect was that the top of
this aluminum block is cored out to accommodate Exetainer vials which are
taller. So when the syringe pulls out of the septum after dropping acid it
may (but not always) lift the  shorter Wheaton Vials up a little bit
(~0.5cm). When the syringe re-visits the vial to sample the generated CO2
it first stops on top of the septum to flush the inner needle and is then
inserted all the way. If the vial is too high (that 0.5cm I was talking
about), the syringe may partially inject during the flush cycle and I may
loose some CO2. At this point I manually push the vials down after the acid
injection, but thats not exactly an automated leave it for the weekend method.


  At 12:45 PM 6/22/2005, Stephen S. Howe wrote:
>Clemente and others:
>Wheaton makes a conical-shaped vial (they call them V-vials) that has
>a volume of 1.0 mL, an O.D. of 13 mm, and uses a 13-425 screw cap
>with a hole in the center that can be lined with silicone rubber
>septa and Kel-F liners.  Wheaton's part number is 986284 and can be
>found through Fisher, VWR, etc., or probably directly through
>Wheaton.  You should make sure that the vials will fit in the holes
>of the heated rack of the MultiPrep or MultiFlow attached to the
>Gilson 222 XL autosampler before you buy a big batch of them.  The
>heated rack that was installed with our MultiPrep in 1996 had holes
>that could accomodate Wheaton vials that were actually being made
>with an O.D. very slightly smaller than 13 mm at that time.  Shortly
>thereafter Wheaton's vials "returned" to their nominal O.D. of 13 mm
>and no longer fit in our rack.  Fortunately, we purchased quite a few
>of the smaller-diameter vials but they are starting to wear out.  The
>alternative would be to have the holes of our heated rack bored out
>very slightly, and eventually, we may have to resort to this remedy.
>Hope this helps!
>Stephen S. Howe                         Office:  (518) 442-5053
>Dept. of Earth & Atmos. Sciences        Stable Isotope Lab:  (518) 442-4471
>Earth Science 352B                      FAX:  (518) 442-5825
>University at Albany                    E-mail:  [log in to unmask]
>1400 Washington Avenue
>Albany, NY  12222-0001

Toti Larson Ph.D.
Los Alamos National Laboratory
Earth and Environmental Sciences                505.667.9894 (lab)
Los Alamos, New Mexico 87545            550.667.8006 (office)