consistent with existing literature data. The analysis of the Re-Os systematics of minute sample powders revealed

Overview

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Key numbers

The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:

• The reproducibility of ten replicate analyses generally yielded less than 10%, except for Sn, Sb, and Mo, which is
• considering a range of formation and evolutionary pro‐ OSIRIS-Rex (Lauretta et al., 2017) give an opportunity
• <10% of aliquots of the dissolved sample solution, and solutions.
• cleaned with ultrapure water and 1% solution of high- amounts of residual solids in the quartz glass tube was
• in 1% solution of TMSC for at least 24 h, followed by nique with 15 μl of concentrated HBr and 10 μl of
• S-Mg-Al-Fe, Ge-Zr-Sn-Sb-Hf-Ta, Se-Te, Ru-Rh-Pd-Re- 0.5 mol l–1 HCl. A fraction containing 6% (0.5 ml out of
• Ir-Pt-Au, Y-Tm-Yb-Lu, and Cd-Hg-Pb-U were prepared 9 ml) of the sample solution and 40% (4 ml out of 10 ml)
• The remaining 94% (8.5 ml out of 9 ml) of the sample vent extraction with a mixture of 0.5 ml of 0.025 mol l–1
• solution and 60% (6 ml out of 10 ml) of the blank solu‐ BPHA in CHCl3 for further purification. Finally, 0.5 ml
• cup collectors. A 1013 Ω amplifier was equipped with the mined using the ID-IS method. Tables 1 and 2 show the
• Os ratio being less than 550 ppm. Analysis of the UMd by measurements of multiple mixtures of the spike and
• (2s, n = 4) using the SEM peak jumping and FC static Pd/108Pd, 119Sn/118Sn, 121Sb/123Sb, 126Te/128Te, 185Re/
• Table 2. Analytical mode, scanning conditions, and BEC in ICP-MS/MS
• 0.36 Mg MgO 0.01 0.6 ppb 952 ppb
• Al AlO 0.01 2 ppb 84 ppb
• S SO 0.01 5 ppb 536 ppb
• S SO 0.01 10 ppb 536 ppb
• Ca CaO 0.01 3 ppb 88 ppb
• Fe FeO 0.01 0.2 ppb 186 ppb
• BEC: Background equivalent concentration. n.d.: not detected. Diluted CI concentration: diluted CI chondrite (Lodders, 2021) concentration at DF =
• Rh Pb Pb2+/Pb+ 0.01% 0.02%
• with CRC in HSE and VCE analyses, particularly in Table 3 summarizes the interference formation ratios
• Table 2 displays the isotopes analyzed and their corre‐ oxides, especially RbO+, SrO+, and CdO+, which were
• The doubly charged ions of rare earth elements of 95% or greater for all HSE via the cation exchange
• (Table 3). On the other hand, the efficiency of the He- In order to assess potential losses and gains for HSEs,
• TmO+, YbO+, LuO+, HfO+, and TaO+, as their interfer‐ the prepared standard solution are as follows: 450 ppb
• ence contribution rates were not insignificant. To deter‐ for Mg, 200 ppb for S, 40 ppb for Ca and Ni, 30 ppb for
• mine the formation rates of isobaric interferences used to Al, 20 ppb for Na, 15 ppb for Ge, 10 ppb for Cr and Mn,
• correct spectral interferences, we used the results from 5 ppb for V, Co, Cu, Zn, As, Se, Rb, Sr, Zr, Sn, Cd, Te,
• the analysis of a multi-element standard solution before Hg, Pb, and U, 1 ppb for Ru, Rh, Pd, Re, Ir, Pt, and Au,
• analyzing the samples. 0.5 ppb for Nb, Mo, Sb, Hf, Ta, W. The differences in
• VCE. Spectral interference correction is necessary for ments after CCl4 extraction, indicating nearly 100% of
• high reliability. 100%, with calculated blanks of 14 ng Na, 43 ng Ca, and
• analytes during CCl4 solvent extraction these blanks are sufficiently small (<0.06% for Na,
• The method presented here involves Os isotope analysis <0.05% for Ca, <0.2% for Zn) compared to the content
• evaluate the contribution of each blank source. Table 4 cols for Os isotope analysis, except for the nitric acid
• Blank A in Table 4 was estimated based on the analysis bution of nitric acid as a prominent source of Os blanks,
• For Os, a blank derived from the subsequent micro- with an RSD greater than 50%, mainly due to the low
• Table 4. Summary of the procedural blank
• The Blank B in Table 4 is the value when the fraction The equation for the ID method expresses the true
• of the blank measurement is 60% (P = 0.6) and the concentration in the sample solution after chemical sepa‐
• chemical yield is assumed to be 100% (Y = 1), which is ration as follows;

Methods (brief)

• Applicability of quartz tube digestion for the
• compositions using ICP-MS/MS and N-TIMS
• developed a method using a sealed glass tube digestion to simultaneously measure the 187Os/188Os ratios and the
• the potential blank increase from the quartz tube digestion and subsequent chemical process and the loss of other
• Allende meteorite reference sample provided by the Smithsonian Institution (Smithsonian Allende). The
• elemental abundances were determined by the isotope dilution (ID) coupled with ICP-MS/MS, excluding those of
• consistent with existing literature data. The analysis of the Re-Os systematics of minute sample powders revealed
• heterogeneity observed in the Smithsonian Allende is closely related to sample size.
• Keywords highly siderophile element, volatile chalcophile element, 187Os/188Os, quartz-tube digestion, chondritic meteorites
• chalcophile elements, demonstrating resolvable differ‐ Recent sample return missions such as the Hayabusa2
• Fujita, R., Nakano, S., Yokoyama, T. and Ishikawa, A. (2024) Applicability of quartz tube digestion for the determination of highly siderophile and volatile chalcophile
• element abundances with Os isotopic compositions using ICP-MS/MS and N-TIMS. Geochem. J., 58, 9–27.
• involving sample destruction presents the most reliable 2006) was applied to quantify the abundance of Mg, Al,
• topic data from a limited amount of sample (Nakamura chondrites, including the Smithsonian Allende from the
• et al., 2022; Yokoyama et al., 2023). For example, same digestion aliquot for 187Os/188Os and other HSEs
• dered samples from aggregates of Ryugu samples. The nique for quantifying Rh and Au relative to Ir after
• authors digested the samples in clean Teflon vials by cation exchange chromatography (Meisel et al., 2003),
• HCl, and H2O2. The abundances of 54 elements were using ICP-MS/MS coupled with collision-reaction cell

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