Shapna

900 mV <64> on 100ug S seems rather low. We typically get about 6000 mV
on that amount of S (in the form of about 750ug BaSO4) on our
EA-Delta+XL system.

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 Shapna Mazumder
Sent: 27 February 2007 00:06
To: [log in to unmask]
Subject: [ISOGEOCHEM] Sulphur Analysis

Hello All who do sulphur analysis,
I have been running sulphur analysis on feathers using Bovine Liver as
working standard on a Costech EA- Delta V Advantage. After running two
dozen samples on a new combustion column and water trap the sulphur peak
is broadening, which seems to be effecting the d34S by about 1 per mil
(although the combustion hasn't been effected).  Reintegrating the
chromatogram helps if I do them individually.  Two questions, what could
be contributing to the peak broadening and in terms of source
sensitivity what should I be getting on mass 64 for a sample containing
100ug S, presently I am getting ~900 mV for 100ug S.  Any help will be
greatly appreciated.  
Thanks.
Regards,
Shapna

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