Troy,
          We have analyzed various fish parts for sulfur isotopes.  The
material was freeze dried and then put through the Eschka process.  The
resulting BaSO4 was analyzed on our EA/ MS system.  We found that there
wasn't enough sulfur in the fish tissue (or liver) to run directly.  I hope
that's somewhat helpful.

          Pam

*********************************************
Pamela Gemery
Geologist
U.S. Geological Survey
Box 25046, DFC, MS 973
Denver, C.O. 80225
Ph: (303)236-1920
Fax: (303)236-3200
[log in to unmask]
*********************************************