Determination of the triple oxygen and carbon isotopic composition of CO2 from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer

摘要

RationaleDetermination of δ¹⁷O values directly from CO2 with traditional gas source isotope ratio mass spectrometry is not possible due to isobaric interference of ¹³C¹⁶O¹⁶O on ¹²C¹⁷O¹⁶O. The methods developed so far use either chemical conversion or isotope equilibration to determine the δ¹⁷O value of CO2. In addition, δ¹³C measurements require correction for the interference from ¹²C¹⁷O¹⁶O on ¹³C¹⁶O¹⁶O since it is not possible to resolve the two isotopologues.