Precise Elemental and Isotopic Analyses in Silicate Samples Employing ICP-MS: Application of Hydrofluoric Acid Solution and Analytical Techniques

Makishima, Akio; Tanaka, Ryoji; Nakamura, Eizo

doi:10.2116/analsci.25.1181

Cited by 36 publications

(25 citation statements)

References 36 publications

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“…Trace element abundances were determined by inductively coupled plasma mass spectrometry using an Agilent 7500cs instrument, following the methods of Yokoyama et al (), Makishima and Nakamura (), and Lu et al (). Bomb decompositions were employed to ensure digestion of acid‐resistant minerals such as zircon (Makishima et al, ), and all analyses were duplicated. Analytical reproducibilities (1σ) are 1% and 3–5% for major and trace element analyses, respectively.…”

Section: Methodsmentioning

confidence: 99%

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

et al. 2018

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We present K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data for late Cenozoic volcanic rocks from the Chugoku district, southwest Japan arc. Andesite and dacite lavas in this region are enriched in Sr (mostly >800 μg g À1 ) and show geochemical characteristics of volcanic rocks commonly referred to as "adakite." K-Ar dating of these lavas revealed that the eruption of high-Sr andesitic to dacitic magmas occurred during the last 2 Myr, following or concurrent with the eruption of basalt in adjacent regions. Trace-element characteristics of high-Sr andesites and dacites are consistent with the formation of their parent magmas by partial melting of the basaltic layer of the subducting Shikoku Basin Plate. Mass balance modeling of trace element concentrations and isotopic compositions suggests that the parental magmas of high-Sr andesites and dacites are best explained by mixing of partial melts from oceanic crust (F = 5-15%) and sediment (F = 30%) at 80:20 to 55:45 ratios. Spatial coincidence of the occurrences of high-Sr andesites and dacites and seismic gaps of the subducting slab demonstrates the causal link between slab melting and mantle upwelling at slab tears. We speculate that these tears could have been formed by subduction of ridges on the plate. A warm mantle upwelled through tears, preventing the solidification of the siliceous slab melts in the mantle and facilitating the transportation of these melts to the surface.The southwest (SW) Japan arc (Figure 1) is an example of a volcanic field in which high-Sr andesites and dacites occur (Figure 2;Feineman et al., 2013;Kimura et al., 2014;Morris, 1995). Like others, the SW Japan arc is characterized by the occurrence of basalt lavas in closed spatial and temporal proximity. It is PINEDA-VELASCO ET AL.3698

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Section: Methodsmentioning

confidence: 99%

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

et al. 2018

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“…Effects of acids on dissolution of fluoride precipitates Hu et al (2010) suggest that adding 1-2 ml HNO 3 to the treated powder after NH 4 F ⁄ HNO 3 attack but before evaporation apparently suppresses the formation of fluorides. In contrast, evaporation with HClO 4 is the most common method to suppress the formation of fluorides (Langmyhr 1967, Croudace 1980, Boer et al 1993, Yokoyama et al 1999, Yu et al 2001, Makishima et al 2009). In this study, serial experiments designed to digest GSP-2 (150-300 mg) were undertaken, involving the addition of mineral acids (HCl, HNO 3 and HClO 4 ) after attack by 2 ml of HF.…”

Section: Icp-ms/referencementioning

confidence: 99%

Reassessment of HF/HNO3 Decomposition Capability in the High-Pressure Digestion of Felsic Rocks for Multi-Element Determination by ICP-MS

Zhang

Liu

et al. 2012

Geostandards and Geoanalytical Research

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Complete dissolution is essential to obtain accurate analytical results for geological samples. Felsic rocks are known to be very difficult to dissolve because of the presence of refractory minerals such as zircon. In this study, we undertook a systematic evaluation of the effect of the HF/HNO3 ratio, digestion time, digestion temperature, digested test portion mass and the presence of insoluble fluorides on analytical results for the felsic rock GSP‐2 using high‐pressure HF and HF/HNO3 digestion. Digestion in mixtures of HF and HNO3 acids is a commonly used method of dissolution for geological samples. However, our results clearly indicate that adding HNO3 inhibited the digestion capabilities of HF for refractory minerals such as zircon. It took 8–12 hr for Zr to be completely recovered in GSP‐2 at 190 °C, whereas it needed about 36 and 72 hr at 160 and 140 °C, respectively. White precipitates were observed in the final solution for test portion mass > 100 mg, irrespective of which of the five different digestion solutions was used (1 ml HF, 2 ml HF, 1 ml HF + 0.5 ml HNO3, 1 ml HF + 1 ml HNO3 and 1.5 ml HF + 1.5 ml HNO3). Environmental scanning electron microscopy showed that these precipitates were mainly composed of AlF3. Instead of further HCl, HNO3 or HClO4 attack, we propose that using ultra‐fine samples and a small sample size is a good way to avoid the formation of insoluble residues (e.g., fluorides). To further investigate the precision and accuracy of the proposed method (using HF alone as the digestion solution during the first acid attack step), a suite of silicate rock reference materials was analysed. Most of the results were found to be in reasonable agreement with the reference values, with a relative error of < 10%.

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“…However, ~ 6% of Zr and ~ 3% of Hf remained in HSE cut for the desilicified matrix‐containing synthetic sample (Figure ). This reveals that fluoro‐complexes of Zr and Hf, which are more stable than chloro‐complexes of these elements (Makishima et al ), remained in the solution even after repeated addition of HCl. Because the K d values of Zr, Hf and HSEs are nearly identical between LN resin and 0.5 mol l −1 HF, it is difficult to separate these elements by the second column (Table ).…”

Section: Resultsmentioning

confidence: 94%

A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples

Zhou

Tanaka

Yamanaka

et al. 2019

Geostandard Geoanalytic Res

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Sample decomposition using inverse aqua regia at elevated temperatures and pressures (e.g., Carius tube or high‐pressure asher) is the most common method used to extract highly siderophile elements (HSEs: Ru, Rh, Pd, Re, Os, Ir, Pt and Au) from geological samples. Recently, it has been recognised that additional HF desilicification is necessary to better recover HSEs, potentially contained within silicate or oxide minerals in mafic samples, which cannot be dissolved solely by inverse aqua regia. However, the abundance of interfering elements tends to increase in the eluent when conventional ion‐exchange purification procedures are applied to desilicified samples. In this study, we developed an improved purification method to determine HSEs in desilicified samples. This method enables the reduction of the ratios of isobaric and polyatomic interferences, relative to the measured intensities of HSE isotope masses, to less than a few hundred parts per million. Furthermore, the total procedural blanks are either comparable to or lower than conventional methods. Thus, this method allows accurate and precise HSE measurements in mafic and ultramafic geological samples, without the need for interference corrections. Moreover, the problem of increased interfering elements, such as Zr for Pd and Cr for Ru, is circumvented for the desilicified samples.

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Precise Elemental and Isotopic Analyses in Silicate Samples Employing ICP-MS: Application of Hydrofluoric Acid Solution and Analytical Techniques

Cited by 36 publications

References 36 publications

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

Reassessment of HF/HNO3 Decomposition Capability in the High-Pressure Digestion of Felsic Rocks for Multi-Element Determination by ICP-MS

A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples

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