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