高校地质学报2024，Vol.30Issue(2)：133-141,9.DOI:10.16108/j.issn1006-7493.2023004
NaOH碱熔法在硅酸盐硼同位素测试中的应用
NaOH Alkaline Fusion Method for B Isotope Analysis of Silicates
摘要
Abstract
Boron(B)isotope analysis is an important tool in the research of earth and planetary science.However,challenges still exist for precise and accurate measurements of boron isotope ratios of silicate material due to the challenges in sample digestion.Alkaline fusion is a suitable sample dissolution method for boron isotope analysis in silicates.At present,alkaline fusion methods require expensive platinum or glassy carbon crucibles as well as high flux-to-sample ratios.Additionally,the existing methods used for dissolving the fusion cake may cause boron loss.To achieve full dissolution and effectively prevent B loss,this study reports an improved alkali fusion method using sodium hydroxide and silver crucibles with a low flux-to-sample mass ratio of 5:1.Full dissolution was achieved through gentle heating in the presence of water combined with a stepwise dissolution procedure,which effectively prevented B loss during the dissolution of the fused alkaline cake.Using this improved procedure for dissolution,Amberlite IRA743 B-specific resin for B purification,and a multi-collector inductively coupled plasma mass spectrometer(MC-ICP-MS)for isotope analysis,we report boron isotope compositions and concentrations data for five silicate international standards.The results are consistent with the published data within analytical uncertainties.This safe and efficient method will greatly facilitate B isotope research of silicates.关键词
硼同位素/碱熔法/离子交换/多接收电感耦合等离子体质谱仪Key words
boron isotope/alkaline fusion/ion-exchange chromatography/MC-ICP-MS分类
天文与地球科学引用本文复制引用
李正辉,蔡悦,魏海珍,李烨,张微微,李百蝉..NaOH碱熔法在硅酸盐硼同位素测试中的应用[J].高校地质学报,2024,30(2):133-141,9.基金项目
国家重点研发计划项目(2023YFC2906601) （2023YFC2906601）
国家工程研究中心天然气水合物勘探开发创新研究基金(Grant NO.2022GMGSCXYF410010) （Grant NO.2022GMGSCXYF410010）
东华理工大学博士启动基金(DHBK2019306)联合资助 （DHBK2019306）
