A re-assessment of nickel-doping method in iron isotope analysis on rock samples using multi-collector inductively coupled plasma mass spectrometry

作者：Hongmei Gong,Pengyuan Guo,Shuo Chen,Meng Duan,Pu Sun,Xiaohong Wang,Yaoling Niu

摘要：Element doping has been proved to be a useful method to correct for the mass bias fractionation when analyzing iron isotope compositions.We present a systematic re-assessment on how the doped nickel may affect the iron isotope analysis in this study by carrying out several experiments.We find three important factors that can affect the analytical results,including the Ni:Fe ratio in the analyte solutions,the match of the Ni:Fe ratio between the unknown sample and standard solutions,and the match of the Fe concentration between the sample and standard solutions.Thus,caution is required when adding Ni to the analyte Fe solutions before analysis.Using our method,theδ56Fe and δ57Fe values of the USGS standards W-2 a,BHVO-2,BCR-2,AGV-2 and GSP-2 are consistent with the recommended literature values,and the long-term(one year) external reproducibility is better than 0.03 and 0.05‰(2 SD) for δ56Fe and δ57Fe,respectively.Therefore,the analytical method established in our laboratory is a method of choice for high quantity Fe isotope data in geological materials.

发文机构：Key Laboratory of Marine Geology and Environment Qingdao National Laboratory for Marine Science and Technology Department of Earth Sciences School of Earth Science and Resources Institute of Oceanology

关键词：FeisotopeNi-dopingStableisotopePrecisionandaccuracyMassbiascorrectionPseudohighmassresolution

分类号： O57[理学—粒子物理与原子核物理]