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Dear Greg and others,
to complete the references about isotopic analysis of S and O in sulfate:

Sakai, H.. Sulfate-water isotope thermometry applied to geothermal systems.
Geothermics (1977), 5(1-4), 67-74.

SCOPE 43 - Stable Isotopes: Natural and Anthropogenic Sulphur in the
Environment
H.R. Krouse & V.A. Grinenko eds., 1991, 466 pp, Wiley, U.K. (out of print???
http://www.icsu-scope.org/ )

Regards.
T
***
Tiziano Boschetti
Dipartimento di Scienze della Terra - UniversitÓ di Parma
(Earth Sciences Department - University of Parma)
Parco Area delle Scienze 157a
43100 Parma, ITALY
Fax:      +39-(0)521-905305
e-mail1: [log in to unmask]
e-mail2: [log in to unmask]

----- Original Message -----
From: "Pier de Groot" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 30, 2004 4:41 PM
Subject: Re: [ISOGEOCHEM] sulfate 18O


> Bob and Greg,
>
> Is described in the Sakai and Krouse (1971) paper, with a good and
> explanatory picture of the structure. Ref given in my former message.
>
> Pier.
>
>
> > Greg, cannot find that paper at this time but when Van Stempvort
> > was at Waterloo, he used carbon mixed with sulphate wrapped in a
> > platinum or molybdenum foil between two electrodes that induced
> > high temp reaction to form CO/CO2. The CO was converted to CO2
> > in an arc between two platinum electrodes.
> > This design was in thesis by  Shakur at Krouse's lab in Calgary and
> > the system was copied at Waterloo.
> > Bob
> >
> >
> >
> > Date sent:              Mon, 29 Nov 2004 19:16:35 -0800
> > Send reply to:          Stable Isotope Geochemistry
<[log in to unmask]>
> > From:                   Greg Michalski <[log in to unmask]>
> > Subject:                sulfate 18O
> > To:                     [log in to unmask]
> >
> >> Is anyone familiar with the sulfate 18O analysis technique of Van
Stepvoort
> >> and Krouse?  In the literature Ive found discussions about SiO2/V2O5
> >> conversion to SO2.  Im assuming the oxygens are all exchanged during
this
> >> reaction and this is the means to get the 34S number, but its unclear
where
> >> the 18O numbers are coming from.  Im assuming its graphite reduction to
CO2
> >> or CO but I can not find that explicitly stated in any of the papers.
Are
> >> there any references to the 18O aspect other than Van Stepvoort's PhD
thesis?
> >>
> >> Greg Michalski
> >> Stable Isotope Lab, 5108 Urey Hall
> >> University of California, San Diego
> >> 9500 Gilman Dr.
> >> La Jolla, Ca. 92093-0356
> >> 858-534-6053
> >