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|Type:||Artigo de periódico|
|Title:||Reference Materials In Geochemical And Environmental Research|
|Abstract:||In all fields of geochemistry, cosmochemistry, and environmental research, reference materials play an important role. They are used as samples for calibration of analytical instruments and to establish metrological traceability to measurements, quality control and assurance, and interlaboratory comparisons. The International Organization for Standardization Committee on Reference Materials (ISO/REMCO) works to establish and update internationally agreed guidelines concerning terminology, production, characterization, certification, and use of reference materials. Many reference materials are homogeneous rock powders, synthetic and natural silicate glasses, minerals, and environmental materials. So-called delta zero, radioactive and radiogenic isotopic reference materials are necessary for normalization purposes of isotope ratio measurements. Geochemists can easily have access to information about reference materials using the GeoReM database.Although many rock reference materials have been produced, only few of them have been certified by ISO-compatible procedures. There is a need for microanalytical reference materials, especially for homogeneous and well-characterized mineral samples. The situation is also unsatisfactory for isotopic reference materials. Many isotopic reference materials are heterogeneous in the isotopic composition, because they were made from oxides or metal, do not have certified values, and have isotope ratios much far from any natural sample or not available any more. © 2014 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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