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 (R) 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 using Ti-47-Ti-49 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 delta Ti-49/46, 2 sd), which was better than that of Standard-Sample Bracketing.
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