Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer
This report describes procedures used in the Geology, Geophysics, and Geochemistry Science Center of the U.S. Geological Survey in Denver, Colorado, to determine the stable-isotope ratios 13 C/ 12 C, 15 N/ 14 N, and 34 S/ 32 S in solid materials. The procedures use elemental analyzers connected directly to gas-source isotope-ratio mass spectrometers. A different elemental–analyzer–mass-spectrometer system is used for 13 C/ 12 C and 15 N/ 14 N than is used for 34 S/ 32 S to accommodate differences in reagents, catalysts, and instrument settings.
Techniques and Methods↗