Can you re-state your question more precisely? Are you inquiring about
thermal decomposition of raw sediment in an EA and contunious-flow IRMS to
determine 34S/32S ratios for total sulfur? There is usually enough S in
marine sediments to generate a decent SO2 peak. I am however not sure,
whether somebody has figured out a solution for applying a reliable oxygen
correction at mass 66 (32S18O16O) for such samples.
There are of course also numerous techniques for extracting specific S
compounds from sediments and convert them into either BaSO4 and Ag2S.
CF-IRMS on these pure inorganic sulfur compounds has been performed
routinely since more than a decade (e.g. Pichlmayer & Blochberger,
Fresenius Z. Anal. Chem. 331:1961- (1988), Giesemann et al., Anal. Chem.
66: 2816- (1994), as you probably know.
Stable Isotope Laboratory
University of Calgary
Calgary, Alberta, Canada T2N 1N4
From: Gregory Wandless [SMTP:[log in to unmask]]
Sent: Monday, February 14, 2000 12:27 PM
To: [log in to unmask]
Has anybody out there had any experience analyzing sulfur isotopes in
marine sediments using an the EA/MS method?
Gregory A. Wandless
US Geological Survey
Reston, VA 20192
Email:[log in to unmask]
Phone: (703) 648-6189