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Partial pressure dependency of 17 O/ 16 O and 18 O/ 16 O of molecular oxygen in the mass spectrometer
Author(s) -
Abe Osamu,
Yoshida Naohiro
Publication year - 2003
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.923
Subject(s) - chemistry , mass spectrometry , analytical chemistry (journal) , partial pressure , oxygen 18 , ion , oxygen , oxygen 17 , isotope separation , fractionation , isotope , radiochemistry , chromatography , atomic physics , nuclear physics , physics , organic chemistry
A method to determine both 17 O/ 16 O and 18 O/ 16 O ratios for molecular oxygen with high precision by direct introduction into the mass spectrometer without gas separation is presented. Because both 17 O/ 16 O and 18 O/ 16 O in mixed gases have good linear correlations with their mixing ratios, these isotopic compositions can be determined without a gas‐separation procedure by calibration using prepared standard gases with variable mixed ratios and by monitoring the amounts of fragment ions. Analytical precision for δ 17 O and δ 18 O of 45 and 7 per meg, respectively, were obtained. The observed partial pressure dependency of isotopic composition may be caused by isotope fractionation during admission from the ionization chamber into the flight tube of the mass spectrometer. Copyright © 2003 John Wiley & Sons, Ltd.