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Homogeneity of the geochemical reference material BRP-1 (paraná basin basalt) and assessment of minimum mass

Geostandards and Geoanalytical Research

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, , , , , and
DOI: 10.1111/j.1751-908X.2007.00111.x

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Abstract

Reference materials (RM) are required for quantitative analyses and their successful use is associated with the degree of homogeneity, and the traceability and confidence limits of the values established by characterisation. During the production of a RM, the chemical characterisation can only commence after it has been demonstrated that the material has the required level of homogeneity. Here we describe the preparation of BRP-1, a proposed geochemical reference material, and the results of the tests to evaluate its degree of homogeneity between and within bottles. BRP-1 is the first of two geochemical RM being produced by Brazilian institutions in collaboration with the United States Geological Survey (USGS) and the International Association of Geoanalysts (IAG). Two test portions of twenty bottles of BRP-1 were analysed by wavelength dispersive-XRF spectrometry and major, minor and eighteen trace elements were determined. The results show that for most of the investigated elements, the units of BRP-1 were homogeneous at conditions approximately three times more rigorous than those strived for by the test of “sufficient homogeneity”. Furthermore, the within bottle homogeneity of BRP-1 was evaluated using small beam (1 mm2) synchrotron radiation XRF spectrometry and, for comparison, the USGS reference materials BCR-2 and GSP-2 were also evaluated. From our data, it has been possible to assign representative minimum masses for some major constituents (1 mg) and for some trace elements (1-13 mg), except Zr in GSP-2, for which test portions of 74 mg are recommended.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Homogeneity of the geochemical reference material BRP-1 (paraná basin basalt) and assessment of minimum mass
Series title:
Geostandards and Geoanalytical Research
DOI:
10.1111/j.1751-908X.2007.00111.x
Volume
31
Issue:
4
Year Published:
2007
Language:
English
Publisher:
Elsevier
Description:
15 p.
First page:
379
Last page:
393
Country:
Brazil
State:
Sao Paulo
City:
Ribeirao Preto
Online Only (Y/N):
N
Additional Online Files(Y/N):
N