"Characterization of a New Iron Isotopic Reference Material Using Two Independent Methods for Instrumental Mass Bias Correction "

Isotopic reference materials are crucial to the development of non-traditional stable isotope systems for both securing accurate and precise isotope ratio measurements and enabling comparison of isotope ratio data obtained at different laboratories.In this study, a new iron isotopic reference material, NIM-RM 2712, has been developed to fulfill the demand of reliable Fe isotopic data in geochemical, environmental and biological researches.This reference material exhibits sufficient homogeneity and stability for application in Fe isotopic analysis.The property values of NIM-RM 2712 were characterized as (U, k=2): δ 56 FeIRMM-014 = 0.461 ± 0.043‰ and δ 57 FeIRMM-014 = 0.693 ± 0.064‰ by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) on the use of two independent instrumental mass bias correction models: the standard-sample bracketing method and the double spike approach.This new Fe isotopic reference material can be recommended as a secondary isotopic standard or as a replacement for the conventional reference material IRMM-014 when it becomes exhausted.