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Jason

Depends on the weight of the capsules - which depends on the supplier
(e.g Elemental Microanalysis vs Costech or whoever). 'Heavier' 3x5 mm
caps fill the crucible after about 150 samples. 'Lighter' ones half fill
the crucible after 200 samples (i.e. 2 full runs). So we extract and
replace the crucible after 200 samples. The problem with filling the
crucible is not just possible overflow of silver causing flow problems,
but extracting the crucible with the springy wire tool is impossible if
the crucible is filled with silver.

Tim 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 Jason Newton
Sent: 23 June 2008 14:08
To: [log in to unmask]
Subject: [ISOGEOCHEM] TCEA

Hi all,

we've just bought a TCEA; jut finished installing it this morning so
hope to be able to run some test sample tomorrow once the GC has cooled
down.
I was reading some of the old discussions on the list, and wondered what
is the maximum number of 3 x 5 mm capsules that can be dropped before
the graphite crucible fills up and I start to get problems with the flow
- the crucible seems to be exceptionally small for large sample
throughput.


cheers,

Jason




--
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Dr. Jason Newton
East Kilbride Node Manager
NERC Life Sciences Mass Spectrometry Facility Scottish Universities
Environmental Research Centre Rankine Avenue Scottish Enterprise
Technology Park East Kilbride
G75 0QF
UK

e-mail: [log in to unmask]
http://www.gla.ac.uk/centres/suerc/nerc/lifesciences/index.html
[updated 4/6/08]
http://www.gla.ac.uk/centres/suerc/staff/newtonj.html [updated 22/5/08]
http://www.chm.bris.ac.uk/lsmsf/
tel: +44 (0) 1355 270138
fax: +44 (0) 1355 229898

6th International Conference on Applications of Stable Isotope
Techniques to Ecological Studies Hawaii, 2008.
http://www.isoecol.org/index.htm [updated 18/6/08]

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