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Stable Isotope Geochemistry

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From:
lowell stott <[log in to unmask]>
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Date:
Tue, 23 May 2006 09:25:44 -0700
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Tim,
Our solution to this was to enlarge the opening in the ss boats and place a
small, 3mm glass bead on top of the sample. This holds the material (i.e.
forams) in the boat until submerged in the acid. 
Lowell

Dr. Lowell D. Stott
Dept. Earth Sciences
University of Southern California
3651 Trousdale Pkwy
Los Angeles, CA 90089
213-740-5120
earth.usc.edu/~stott


-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
Of Heaton, Timothy HE
Sent: Tuesday, May 23, 2006 9:07 AM
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] jumping ostracod shell in Kiel device


I'm not familiar with the Kiel setup, but we experienced problems with
forams jumping out of the 'buckets' on the carousel of the VG Isocarb
(though ostracod shells didn't). I presume this resulted from slight
jiggling of the buckets as the carousel turns round. Yes, the solution was
to crush them.

Tim H.E. Heaton

NERC Isotope Geosciences Laboratory 
British Geological Survey
Keyworth, Nottingham NG12 5GG, England
(www.bgs.ac.uk/nigl/index.htm)

Tel. +44(0)115 936 3401
Email: [log in to unmask]



-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
Behalf Of Biel Obrador
Sent: 23 May 2006 13:22
To: [log in to unmask]
Subject: [ISOGEOCHEM] jumping ostracod shell in Kiel device


Dear subscribers

I am running single ostracod shells on a MAT252 with a Kiel device, and we
found that some of the valves were not completely dissolved. We realised
that in such situation the shell, or part of it, was on the top of the vial,
so that it may have jumped probably due to a bubble during the reaction with
acid.

Has anyone of you found this problem before? Could you give any
recommendation? 
One possible way to avoid such a jump would be crashing the shell. Some
ideas on this or any other thought?

Thanks in advance
Best wishes



-- 



Biel Obrador

Departament d'Ecologia
Facultat de Biologia
Universitat de Barcelona
Av Diagonal, 645
E-08028 Barcelona
SPAIN
Telf: +34 93 402 15 06
Fax:  +34 93 411 14 38

EMAIL: [log in to unmask]






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