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 

机构地区：[1]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China [3]Department of Earth Sciences,Durham University,Durham DH13LE,UK [4]School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China [5]Institute of Oceanology,Chinese Academy of Sciences,Nanhai Road 7,Qingdao 266071,Shandong,China

出　　处：《Acta Geochimica》2020年第3期355-364,共10页地球化学学报（英文）

基　　金：This work was supported by National Nature Science Foundation of China(Grant Numbers 41776067 and 41630968).

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.

关 键 词：Fe isotope Ni-doping Stable isotope Precision and accuracy Mass bias correction Pseudohigh mass resolution 

分 类 号：P585[天文地球—岩石学]