In Situ Determination of Au and Cu in Natural Pyrite by Near‐Infrared Femtosecond Laser Ablation‐Inductively Coupled Plasma‐Quadrupole Mass Spectrometry: No Evidence for Matrix Effects |
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| Authors: | German Velásquez Anastassia Y Borisova Stefano Salvi Didier Béziat |
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| Institution: | 1. Instituto de Ciencias de la Tierra, Universidad Central de Venezuela, Los Chaguaramos, Caracas 3895, Venezuela;2. CNRS, GET, OMP, Université de Toulouse, F‐31400 Toulouse, France;3. CNRS, GET, OMP, Université de Toulouse, F‐31400 Toulouse, France;4. Geological Department, Lomonosov Moscow State University, Leninskie Gory, Moscow 119899, Russia |
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| Abstract: | Gold and copper concentrations were determined in natural pyrite by near‐infrared femtosecond LA‐ICP‐QMS, using both sulfide reference materials (pyrrhotite Po‐726 and in‐house natural chalcopyrite Cpy‐RM) and NIST SRM 610 as external calibrators. Firstly, using NIST SRM 610 as the external calibrator, we calculated the Au concentration in Po‐726 and the Cu concentration in Cpy‐RM. The calculated concentration averages for Au and Cu were similar to the values published for Po‐726 and Cpy‐RM, respectively. Secondly, we calculated Au and Cu concentrations taking NIST SRM 610 as an unknown sample and using Po‐726 and Cpy‐RM as external calibrators. Again, the average values obtained closely reflected the preferred concentrations for NIST SRM 610. Finally, we calculated Au and Cu concentrations in natural pyrite using sulfide and silicate reference materials as external calibrators. In both cases, calculated concentrations were very similar, independent of the external calibrator used. The aforementioned data, plus the fact that we obtained very small differences in relative sensitivity values (percentage differences are between 5% and 17% for 57Fe, 63Cu and 197Au) on analyses of silicate and sulfide RMs, indicate that there were no matrix effects related to the differences in material composition. Thus, it is possible to determine Au and Cu in natural sulfides using NIST silicate glasses as an external calibrator. |
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| Keywords: | matrix effects near‐infrared femtosecond laser LA‐ICP‐MS Au Cu sulfides silicates reference materials effet de matrice laser femtoseconde infra rouge proche LA‐ICP‐MS Au Cu sulfures silicates maté riaux de ré fé rence |
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