【摘要】 建立了玄武岩和橄榄岩样品中钛（Ti）的化学分离方法,特别是对于含低Ti而高Fe和Mg的橄榄岩样品中Ti的化学分离方法进行了探索。实现了通过双稀释剂技术校正的多接收器等离子体质谱（MC-ICP-MS）法测定玄武岩和橄榄岩的Ti同位素组成。玄武岩样品Ti的化学分离采用DGA和AG1-X8两柱法;橄榄岩样品Ti的化学分离采用DGA和AG1-X8三柱法。Ti同位素比值使用MC-ICP-MS测定,测定过程中的仪器质量分馏使用双稀释剂法校正。采用SRM 979 Cr同位素标准物质的⁵³Cr/⁵²Cr=0.11339对Ti同位素标准溶液SRM 3162a和⁴⁷Ti-⁴⁹Ti双稀释剂进行标定。而后,测定分别加入了⁴⁷Ti-⁴⁹Ti双稀释剂的Alfa Ti相对于SRM 3162a Ti的δ^i/46Ti,并用于监控测试过程。使用双稀释剂法测定Alfa Ti的结果为:δ^49/46Ti=-1.77‰±0.08‰（2sd）,δ^48/46Ti=-1.20‰±0.05‰（2sd）,δ^47/46Ti=-0.61‰±0.03‰（2sd）,本方法的外部精度≤0.03‰/amu,优于样品-标样交叉法。更多还原

【Abstract】 A method for high-precision isotope measurement of Ti using multi-collector inductively coupled plasma-mass spectrometry（MC-ICP-MS）was developed.Ti separation for isotope measurement was achieved by ion exchange chromatography using Bio-Rad AG^? 1-X8 anion exchange resin and DGA resin.For the basalt samples,two-column chemistry procedure was used.To get rid of large amounts of Fe and Mg in the peridotite samples,a three-column chemistry procedure was needed.The instrumental mass bias was corrected using⁴⁷Ti-⁴⁹Ti Double Spiking and the Ti isotopes were relative to SRM 3162a.Alfa Ti（Ti standard solutions in house）was measured during three measurement sessions over 10 months with a reproducibility of 0.08‰(in terms of δ^49/46Ti,2 sd),which was better than that of Standard-Sample Bracketing.更多还原