Isotope radio mass spectrometer (IRMS) is the most common stable isotope mass spectrometer. It is used to measure the changes in the natural stable isotope composition of specific elements in compounds. Due to the differences in physical and chemical properties between isotope atoms or compounds with the same number of protons and different numbers of neutrons, isotopes will be distributed in different proportions in different substances during physical, chemical and biological interactions, that is, isotopic fractionation effect occurs. Based on the above characteristics, the isotopic composition of compound elements can be used as a fingerprint feature to obtain the environmental behavior information of compounds. IRMS in ONCE project will be used to quantitatively analyze the source composition of organic matter in sediments and preliminarily estimate the burial efficiency of organic carbon.
(Edited by Ruanhong Cai)