NBS 30 was prepared by I. Friedman, J. R. O'Neil and G. Cebula of the US Geological Survey from a sample of Lakeview tonalite (southern California batholith) provided by L. Silver, California Institute of Technology, Pasadena. The δ2H values should be determined on the water fraction (3.5%), and the δ18O value on the whole sample .
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
 VSMOW scale
GONFIANTINI, R., Advisory group meeting on stable isotope reference samples for geochemical and hydrochemical investigations, IAEA, Vienna, 19-21 September 1983. Report to the Director General. International Atomic Energy Agency, Vienna, Austria (1984).