Improved whole rock low detection limit gold analysis by LA-ICP-MS utilizing pressed-powder-pellets

Patten, Clifford; Beranoaguirre, A.; Hector, Simon; Gudelius, D.; Kolb, Jochen; Eiche, E.

doi:10.1016/j.ijms.2023.117039

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…Since the 1980s, a sample powder particle size of approximately 74 μm (200 mesh) has been commonly used in geoscience sample digestion by the methods described above . Recently, ultrafine particle sizes (<30 μm) were adopted in the preparation of new reference materials and sample powder pellets for LA-ICP-MS bulk analysis. − Based on the study by Tsimbalist, mechanochemical activation (ultrafine milling) can significantly increase the chemical reactivity of materials due to the elevations in specific surface area and paramagnetic center number, which potentially accelerate the mineral acid dissolution. However, the effects of ultrafine powders on the complete acid digestion of refractory geological samples have not previously been reported to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Rapid and Complete Digestion of Refractory Geological Samples Using Ultrafine Powder for Accurate Analyses of Trace Elements

Liu,

Guo,

et al. 2024

Anal. Chem.

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Complete sample digestion is a prerequisite for acquiring high-quality analytical results for geological samples. Closed-vessel acid digestion (bomb) has typically been used for the total digestion of refractory geological samples. However, the long digestion time (4−5 days) and insoluble fluoride complexes still pose challenges for digesting refractory geological samples using this approach. In this study, an efficient and simplified digestion technique combining ultrafine powders from planetary ball milling with bomb digestion was developed for trace element analysis of refractory geological samples: peridotite and granitoid. The method shows two significant improvements compared with previous approaches. (1) By performing dry planetary ultrafine milling, the initial 200 mesh peridotite (<74 μm) could be reduced to 800 mesh (<20 μm) in 6 min at a ball-to-powder mass ratio of approximately 15 using 3 mm tungsten carbide milling balls. (2) Complete peridotite and granitoid dissolution were achieved in approximately 2 h, 60 times faster than what is achievable using previous methods (2 h vs 120 h). Moreover, ultrafine powders effectively suppressed insoluble fluoride formation during bomb digestion. A suite of peridotite and granitoid reference materials were measured to evaluate the stability of this method. This efficient, simple, and reliable sample digestion method could benefit geological, food, environmental, and other fields requiring solid sample decomposition via wet acid, fusion, combustion, or dry ashing.

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Section: Introductionmentioning

confidence: 99%

Rapid and Complete Digestion of Refractory Geological Samples Using Ultrafine Powder for Accurate Analyses of Trace Elements

Liu,

Guo,

et al. 2024

Anal. Chem.

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Magmatic evolution of the Kolumbo submarine volcano and its implication to seafloor massive sulfide formation

Hector,

Patten,

Beranoaguirre

et al. 2024

Miner Deposita

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Seafloor massive sulfides form in various marine hydrothermal settings, particularly within volcanic arcs, where magmatic fluids may contribute to the metal budget of the hydrothermal system. In this study, we focus on the Kolumbo volcano, a submarine volcanic edifice in the central Hellenic Volcanic Arc hosting an active hydrothermal system. Diffuse sulfate-sulfide chimneys form a Zn-Pb massive sulfide mineralization with elevated As, Ag, Au, Hg, Sb, and Tl contents. These elements have similar behavior during magmatic degassing and are common in arc-related hydrothermal systems. Trace-element data of igneous magnetite, combined with whole rock geochemistry and numerical modelling, highlights the behavior of chalcophile and siderophile elements during magmatic differentiation. We report that, despite early magmatic sulfide saturation, chalcophile element contents in the magma do not decrease until water saturation and degassing has occurred. The conservation of chalcophile elements in the magma during magmatic differentiation suggests that most of the magmatic sulfides do not fractionate. By contrast, upon degassing, As, Ag, Au, Cu, Hg, Sb, Sn, Pb, and Zn become depleted in the magma, likely partitioning into the volatile phase, either from the melt or during sulfide oxidation by volatiles. After degassing, the residual chalcophile elements in the melt are incorporated into magnetite. Trace-element data of magnetite enables identifying sulfide saturation during magmatic differentiation and discrimination between pre- and post-degassing magnetite. Our study highlights how magmatic degassing contributes to the metal budget in magmatic-hydrothermal systems that form seafloor massive sulfides and shows that igneous magnetite geochemistry is a powerful tool for tracking metal-mobilizing processes during magmatic differentiation.

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Trace element determination by femtosecond LA-ICP-MS in 10 mg extraterrestrial geological samples prepared as lithium borate glasses

Liu,

Xue,

et al. 2024

J. Anal. At. Spectrom.

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Improved whole rock low detection limit gold analysis by LA-ICP-MS utilizing pressed-powder-pellets

Cited by 4 publications

References 24 publications

Rapid and Complete Digestion of Refractory Geological Samples Using Ultrafine Powder for Accurate Analyses of Trace Elements

Rapid and Complete Digestion of Refractory Geological Samples Using Ultrafine Powder for Accurate Analyses of Trace Elements

Magmatic evolution of the Kolumbo submarine volcano and its implication to seafloor massive sulfide formation

Trace element determination by femtosecond LA-ICP-MS in 10 mg extraterrestrial geological samples prepared as lithium borate glasses

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