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Simultaneous determination of insoluble fluoride-forming and high field-strength element abundances in rock samples by ICP-QMS through isotope dilution-internal standardisation

Kagami, Saya   ; Yokoyama, Tetsuya*

We developed a new method for the determination of the mass fractions of insoluble fluoride-forming elements (IFFEs) and high field strength elements (HFSEs) in rock samples by ICP-QMS. Unlike conventional methods in which the two elemental groups were measured separately using two solutions prepared from distinct sample aliquots, the new technique prepares a solution by acid digestion from a single sample aliquot, then divide the solution into two fractions that are dedicated to the measurement of IFFEs and HFSEs, respectively. The problem regarding the incorporation of IFFEs/HFSEs into insoluble fluorides during HF digestion was overcome by adjusting the Ca-Al-Mg composition of the sample before acid digestion. The acceptable compositional range was Ca/(Ca+Al) $$<$$ 0.43 and Mg/(Mg+Al) $$<$$ 0.40 when the sample was decomposed on a hot plate, while more restricted condition of Ca/(Ca+Al) $$<$$ 0.40, Mg/(Mg+Al) $$<$$ 0.40, and Al/(Mg+Ca) $$<$$ 1.7 was required for the digestion under high pressure and temperature using Teflon bomb. This method achieved the repeatabilities of $$<$$ 4% for most IFFEs and HFSEs, and yielded the mass fractions of most IFFEs and HFSEs that were consistent with the data obtained by conventional methods within $$pm$$5%. The method is applicable not only to precious samples but also to heterogeneous samples containing accessory minerals enriched in IFFEs/HFSEs.

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Category:Geochemistry & Geophysics

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