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• W2029982775 abstract "In this paper we describe a flux-free fusion technique for the highly precise LA-ICP-MS bulk analysis of geological samples. For this purpose we have developed an automated iridium-strip heater with temperature and melt time control. To optimise the homogeneity of the fused glasses and to reduce possible depletion of volatile elements during melting, we undertook experiments with basaltic rock and glass powders using different melting temperatures (1300–1700 °C) and melting times (5-80 s). Major and trace element microanalysis was performed using EPMA and LA-ICP-MS. Homogeneous glasses were obtained for temperatures ≥ 1500 °C and melting times ≥ 10 s. High loss (20-90%) of highly volatile elements (e.g., Cs, Ge, Sn, Pb) was observed for high melting temperatures (≥ 1600 °C) and long melting times (80 s). Standard melting conditions (1600 °C, 10 s) represent a compromise, as the glasses were homogeneous with respect to major and trace elements and, at the same time, were not depleted in elements with condensation temperatures (at a pressure of 10−4 bar) higher than about 900 K (e.g., Zr, Hf, Ba, Sr, REE, U, Mo, Ni, Rb, Ga). Several international geological reference materials with SiO2 ranging between 47% m/m and 59% m/m were prepared using our standard melting conditions (1600 °C, 10 s) and subsequently analysed by LA-ICP-MS. These samples also include the new Brazilian basaltic reference material BRP-1. Matrix-matched calibration of the LA-ICP-MS data was performed using the basaltic reference glasses KL2-G, ML3B-G, BCR-2G and BHVO-2G. Most analytical data agreed within uncertainty at the 95% confidence level with the GeoReM preferred values published in the GeoReM database for reference materials of geological and environmental interest. To demonstrate routine bulk LA-ICP-MS analyses of geochemical and cosmochemical samples using the whole rock fusion technique, we also present trace element data for ocean island basalts from Lanai (Hawaii) and of Martian meteorites.Dans cet article, nous presentons une technique de fusion sans fondant en vue de mesures globales de grande precision par LA-ICP-MS d'echantillons geologiques. Nous avons developpe dans ce but un four automatique a chauffage par filament d'iridium, avec controles de la temperature et du temps de fusion. Pour optimiser l'homogeneite des verres fondus et pour reduire les pertes potentielles d'elements volatiles durant la fusion, nous avons effectue des experiences avec des poudres de roches de basaltes et de verres avec differentes temperatures de fusion (de 1300 a 1700 °C) et differents temps de fusion (de 5 a 80 s). La micro-analyse des elements majeurs et en trace a ete effectuee par EMPA et LA-ICP-MS. Des verres homogenes ont ete obtenus pour des temperatures superieures a 1500 °C et des temps de fusion ≥ 10 s. Des pertes importantes (de 20 a 90%) des elements tres volatiles tels que Cs, Ge, Sn, Pb ont ete observees aux temperatures de fusion elevees (≥ 1600 °C) et aux longs temps de fusion (80 s). Les conditions standards retenues (1600 °C, 10 s) representent un compromis garantissant l'obtention de verres homogenes par rapport aux elements majeurs et traces et, en meme temps, la conservation des elements ayant des temperatures de condensation (a une pression de 10−4 bar) superieures a 900 K (Zr, Hf, Ba, Sr, REE, U, Mo, Ni, Rb, Ga). Plusieurs materiaux de reference certifies internationaux ayant des teneurs en SiO2 entre 47% m/m et 59% m/m ont ete prepares en appliquant ces conditions de fusion standards (1600 °C, 10 s) et analyses ensuite par LA-ICP-MS. Ces echantillons comprennent le nouveau materiau basaltique de reference bresilien BRP-1. La calibration avec des etalons de meme matrice a ete effectuee en utilisant les verres de reference basaltiques KL2-G, ML3B-G, BCR-2G et BHVO-2G. La plupart des donnees est en accord, aux incertitudes de 95% pres, avec les valeurs recommandees publiees dans la base de donnees GeoReM pour les materiaux de reference geologiques et environnementaux. Pour prouver la qualite des analyses de routine par LA-ICP-MS d'echantillons geologiques et cosmologiques par la technique de fusion de roche totale, nous presentons aussi des donnees d'elements en trace sur des basaltes d'iles oceaniques de Lanai (Hawaii) et de meteorites martiennes." @default.
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• W2029982775 date "2008-03-01" @default.
• W2029982775 modified "2023-10-03" @default.
• W2029982775 title "An Automated Iridium-Strip Heater for LA-ICP-MS Bulk Analysis of Geological Samples" @default.
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• W2029982775 doi "https://doi.org/10.1111/j.1751-908x.2007.00871.x" @default.
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