Gilles,

Can you more specific about what the lipids do to the "chemicals" and site a
reference?

Greg

Stable Isotope Geochemistry wrote:

> You can run the samples in an EA-IRMS but lipid extract first.  The lipids
> tend to destroy the chemicals due to microdistillation prior to the flash in
> the EA.  You will probably need about 10mg depending on the %S of course
>
> Gilles
>
> > -----Message d'origine-----
> > De : Robert Van Hale [mailto:[log in to unmask]]
> > Envoyé : 24 février, 2002 17:24
> > À : [log in to unmask]
> > Objet : [ISOGEOCHEM] Organic S extn
> >
> >
> > Dear all,
> > We have a student wishing to measure isotopic composition of
> > organic sulphur
> > in mussel tissue as a tracer for civic sewerage discharge.
> > Can anyone please
> > provide refs or notes for the methods of extraction of
> > sulphur from tissue
> > and collection as sulphate or sulphide.
> > Thanks in advance,
> >
> > Robert Van Hale
> > Department Of Chemistry
> > University of Otago
> > PO Box 52
> > Dunedin
> > New Zealand
> > pH  (+64)(3) 479 7915
> > Fax (+64)(3) 479 7906
> > [log in to unmask]
> > Isotopes'R'us
> >

--
=======================================
Gregory A. Wandless
Chemist
US Geological Survey
MS954
Reston, VA 20192

Email:[log in to unmask]
Phone: (703) 648-6189
=======================================