1. Geochemistry Department, Sandia National Laboratories, P. O. Box 5800, Albuquerque, New Mexico
87185-0754, United States
2. Geosciences Division, National Energy Technology Laboratory, P. O. Box 10940, Pittsburgh,
Pennsylvania 15236, United States
3. National Energy Technology Laboratory, URS 626 Cochrans Mill Road, Pittsburgh, Pennsylvania 15236, United
States