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Revista mexicana de ciencias geológicas
On-line version ISSN 2007-2902Print version ISSN 1026-8774
Rev. mex. cienc. geol vol.22 n.3 Ciudad de México Dec. 2005
Artículos
Characterization of a new set of eight geochemical reference materials for XRF major and trace element analysis
Caracterización de un nuevo set de ocho materiales geoquímicos de referencia para el análisis de elementos mayores y traza por FRX
1Departamento de Geoquímica, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., Mexico. rufino@servidor.unam.mx
Eight new geochemical reference materials for the analysis of major and trace elements in typical geological matrices have been prepared, and their physical and chemical homogeneity has been thoroughly assessed. The materials (IGL sample series) consist of a lateritic soil, a dolomite, a limestone, an andesite, three different syenites and a gabbro, all of them sampled at different localities from Mexico. The results indicate that the IGL samples are physically homogeneous down to a sub-batch of 0.2 g with a 0.05 significance level. Major and trace element provisional composition of these materials was obtained by wavelength-dispersive X-ray fluorescence spectrometry (WD-XRF). Statistical evaluation to verify for “sufficient homogeneity” was applied and sufficient chemical homogeneity at the 0.05 significance level was demonstrated. Calibration curves were constructed using the IGL samples in order to assess their performance as reference materials. Analyses of international reference materials (RGM-1, AGV-1, SDO-1, and Es-3) demonstrate the reliability of the IGL samples for calibration and intercalibration purposes. Provisional concentrations for 24 major and trace elements, as well as FeO and loss on ignition (LOI) values, are provided for all IGL reference materials.
Key words: reference materials; WD-XRF; calibration; sufficient homogeneity; chemical analysis
Se ha preparado un conjunto de ocho nuevos materiales geoquímicos de referencia para el aná-lisis de elementos mayoritarios y traza en matrices geológicas típicas. La serie de materiales IGL está compuesta de un suelo laterítico, una dolomía, una caliza, una andesita, tres diferentes tipos de sienita y un gabro, todos ellos colectados en diferentes localidades de México. La homogeneidad física y química de estos materiales ha sido valorada ampliamente. Los resultados que se presentan aquí indican que las muestras IGL son físicamente homogéneas cuando menos hasta 0.2 g, con un nivel de significancia de 0.05. La composición de los elementos mayoritarios y traza fue determinada por espectrometría de fluorescencia de rayos X en dispersión de longitudes de onda (WD-XRF). La evaluación estadística para verificar la “homogeneidad suficiente” ha sido aplicada, demostrando suficiente homogeneidad química con un nivel de significancia de 0.05. Con el fin de valorar el desempeño de las muestras de la serie IGL como material de referencia, se construyeron curvas de calibración para elementos mayores y traza uti-lizando WD-XRF, y se analizaron cuatro materiales internacionales de referencia geoquímica (RGM-1, AGV-1, SDO-1, Es-3) como muestras desconocidas. Los resultados demuestran la confiabilidad de la serie IGL para el propósito de calibración e íntercalibración. Se presentan los valores provisionales de las concentraciones de 24 elementos mayores y traza, FeO y pérdida por calcinación, para las muestras de referencia de la serie IGL.
Palabras clave: materiales de referencia; WD-XRF; calibración; homogeneidad suficiente; análisis químico
ACKNOWLEDGEMENTS
The authors would like to appreciate the help of Mariano Elias during field work, which was funded by Dra. Elena Centeno. Pablo Peñaflor, Patricia Girón, Sonia Ángeles, Eduardo Morales de la Garza, José Chávez, Edith Zapata, Estela Ramírez and José Antonio Salas are thanked for help and involvement during different stages of sample preparation and analyses. We also thank to Steve Wilson from the United States Geological Survey and Tarmo Kiipli from the Geological Survey of Estonia who kindly provided some of the reference materials used in this work, and Tom Fearn from the Department of Statistical Science, University College, London, for enlightening discussions on sufficient homogeneity. Surendra P. Verma, Takeshi Okai, and two anonymous reviewers are thanked for their comments and suggestions which improved this work.
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Received: February 18, 2005; Revised: June 17, 2005; Accepted: August 17, 2005
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