Dear isotope geochemists,

We want to analyse d18O, d13C from magnesite.

Can anyone give me some information about:
a) fractionation factor between magnesite and phosphoric acid.
b) reaction time for CO2 extraction.

Many thanks in advance.

Ana-Voica Bojar

Dept. of  Geology and Paleontology
Karl-Franzens University
Graz, Austria