We have been analyzing around 100 to 200 micrograms of organic matter
(Leaves, feathers) for dD through the TC/EA of a Delta Plus. Several
analyses on the same sample, e.g. triplicates, are often required.
Dr. Marilyn L. Fogel, Senior Scientist
Carnegie Institution of Washington
5251 Broad Branch Rd., NW
Washington, DC 20015
Main Office 1-202-478-8900