Refined separation of combined Fe–Hf from rock matrices for isotope analyses using AG-MP-1M and Ln-Spec chromatographic extraction resins

A combined procedure for separating Fe and Hf from a single rock digestion is presented. In a two-stage chromatographic extraction process, a purified Fe fraction is first quantitatively separated from the rock matrix using AG-MP-1M resin in HCl. Hafnium is subsequently isolated using a modified version of a commonly applied method using Eichrom LN-Spec resin. Our combined method includes:
• Purification of Fe from the rock matrix using HCl, ready for mass spectrometric analysis.
• Direct loading of the matrix onto the resin that is used for Hf purification.
• Collection of a Fe-free Hf fraction.

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