Ajaz,
Our papers describe both techniques, direct O2 measurement on line by
CFIRMS, and off line separation and conversion of O2 to CO2 and CO2
measurement by DIIRMS.  The papers are again:
Revesz,   K.,  Bohlke,  J.K.,  Smith,  R.L.,  Yoshinari,  T.,  1999,"  d18O
     Composition  of  Dissolved  O2  Undergoing Respiration in Contaminated
     Ground-Water.   IAEA  International Symposium on Isotope Techniques in
     Water Resources Development and Management, Vienna, Austria, 10-14 May
     1999.
Revesz  K.,  Bohlke, J.K., Smith, R.L., Yoshinari, T., 1999, Stable Isotope
     Composition  of  Dissolved O2 Undergoing Respiration in a Ground-Water
     Contamination Gradient.  Morganwalp, D.W., and Buxton, H.T., eds. U.S.
     Geological  Survey  Toxic Substances Hydrology Program--Proceedings of
     Technical  Meeting, Charleston, South Carolina, March 8-12, Volume 2--
     Contamination  of  Hydrologic  Systems  and  Related  Ecosystems: U.S.
     Geological Survey Water-Resources Investigation Report 99-4018B.


Kinga Revesz
Chemist, Stable Isotope Laboratory
U.S.Geological Survey
MS 431
Reston, VA 20192
T:703-648-5865
FAX: 703-648-5274












                    "Koehler,Geoff
                    [NHRC]"                To:     [log in to unmask]
                    <Geoff.Koehler@        cc:
                    EC.GC.CA>              Subject:     Re: 18-O analysis for dissolved
                    Sent by: Stable        oxygen
                    Isotope
                    Geochemistry
                    <ISOGEOCHEM@LIS
                    T.UVM.EDU>


                    06/14/00 05:25
                    PM
                    Please respond
                    to Stable
                    Isotope
                    Geochemistry





Hi Ajaz and all;

I hope this helps you out:

Wassenaar and Koehler, 1999.  An on-line technique for the determination of
the d18O and d17O of gaseous and dissolved oxygen.  Anal. Chem.
71:4965-4968.


Cheers,
        Geoff


Geoff Koehler
Stable Isotope Chemist           [log in to unmask]
Environment Canada               tel. 306.975.5778
11 Innovation Blvd                   FAX:  306.975.5143
Saskatoon, SK, Canada
S7N 3H5


> ----------
> From:         Ajaz Karim[SMTP:[log in to unmask]]
> Reply To:     Stable Isotope Geochemistry
> Sent:         Wednesday, June 14, 2000 11:01 AM
> To:   [log in to unmask]
> Subject:      Re: 18-O analysis for dissolved oxygen
>
> Dear list members,
>
> Does anyone know of a method by which del18-O of dissolved oxygen in
water
> can be measured directly i.e. without converting it into CO2.
>
> Thanks in advance for any information
>
> Sincerely
>
> Ajaz Karim
>
>  - - - - - - - - - - - - - - - - - - - - - -
> Ajaz Karim, Ph.D.
> Department of Earth Sciences
> University of Ottawa, Ottawa
> Ontario, Canada K1N 6N5
> Tel: (613) 562-5800 ext 6639
> Fax: (613) 562-5192
>