Hello, I'm a graduate student undertaking a body of studies in stable isotopes as they apply to biogeochemistry. In studying the methodology behind the mass spectrometry of stable isotopes I have found it difficult to find articles, books, papers which describe the best combinations of mass spectrometry devices (Dual vs Continuous Flow; FAB vs EI, MALDI etc; and Double focusing Mass analysers vs Quadrupole, TOF etc) for stable isotope analysis of the light bioelements (HONCS). I have several books by Bowen, 1988, 1991. "Isotopes In the earth sciences" and "Isotopes and Climates". One by David S. Schimel "Theory and Application of Tracers" 1993. One by Coleman and Fry "Carbon Isotope Techniques" 1991. One by F.A. Mellon and B Sandstrom "Stable Isotopes in Human Nutrition" 1996. Yet I would appreciate any information on commonly available text or advice on MS methods for Stable Isotope analysis which compare the applicability of various types of MS to Stable Isotope Ratio MS. Thank you Clinton Rissmann Lincoln University Dept. of Soil and Physical sciences Canterbury New Zealand