Thank you Tim, Arnold and Rick for helping with the sulphur issue.  Changing 
the insert and water trap eliminated the peak broadening and retuning the 
source took care of the sensitivity issue.  Thanks again.
Regards,
Shapna
----- Original Message ----- 
From: "Heaton, Timothy HE" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 27, 2007 6:47 AM
Subject: Re: [ISOGEOCHEM] Sulphur Analysis


> 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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