At 21:06 09.11.97 -0800, you wrote:
>    Hi, Everybody:   When I use hydrochloric gas to acidify high pH water
>samples  for oxygen isotope ratio analysis using CO2-H2O equilibration
>method, I found  the Delta O-18 of the water shifts to lighter values as
>the pH goes lower. Any  explanation?   Dachun Zhang Global Geochemistry
>Corp.  6919 Eton Ave.  Canoga Park, CA 91303    

Dear Dachun,

if you want to have a more theoretical look on whats happening in the
hydration sphere water in alkali halide solutions, you may look at:

H. Hertz & M. Zeidler (1963): Elementarvorgänge in der Hydrathülle von
Ionen aus Protonen- und Deuteronenrelaxationszeiten. Berichte der
Bunsengesellschaft 67: 774-786.

Regards . . . Dirk

------------------ < Geochemisches Institut Goettingen >--------------------

Dirk Landwehr                  Geochemisches Institut der
                               Georg-August-Universitaet 
                               zu Goettingen
                               Goldschmidtstr. 1
                               D-37077 Goettingen
                               Germany

 Phone: 0-(49)-551-395768
 Fax:   0-(49)-551-393982
 EMail: [log in to unmask]
 WWW access: http://134.76.75.182/docs/dlandw.htm for privat infos
             http://134.76.75.182/docs/ktb.htm for research infos