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Intercomparison of Boron isotope and concentration measurements: Part I: Selection, preparation and homogeneity tests of the intercomparison materials. (Articolo in rivista)

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Intercomparison of Boron isotope and concentration measurements: Part I: Selection, preparation and homogeneity tests of the intercomparison materials. (Articolo in rivista) (literal)

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TONARINI S, PENNISI M., ADORNI-BRACCESI A, DINI A, FERRARA G., GONFIANTINI R., WIEDENBECK M., GRONING M. (2003)
Intercomparison of Boron isotope and concentration measurements: Part I: Selection, preparation and homogeneity tests of the intercomparison materials.
in Geostandards newsletter
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TONARINI S, PENNISI M., ADORNI-BRACCESI A, DINI A, FERRARA G., GONFIANTINI R., WIEDENBECK M., GRONING M. (literal)

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The results of the Intercomparison of boron isotopes are published on Geostandards Newsletter by Gonfianti, Tonarini and other 28 authors in a paper title \"Intercomparison of boron isotope and concentration measurements. Part II: evaluation of results. Fifteen laboratories (virtually all those performing boron isotope analyses in the world) have partecipated to the Intercomparison. Moreover a special workshop on \"Boron isotopes\" convened by R. Gonfiantini, S. Tonarini (I. Geoscienze e Georisorse, CNR, Pisa ; Wiedembeck M. GFZ, Potsdam, germany and Groening M., IAEA, Vienna) )has been helded during the Goldschmidt 2004 conference at Copenhagen. (literal)

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Eight geological materials, all from Italian sources, were selected for intercomparison of boron isotope and concentration measurements. The materials consist of three natural waters (Mediterranean seawater and two groundwaters with large differences in ?11B and B content) and five rocks and minerals characterized by a great variety of compositions, matrix properties, and boron concentrations. Prior to distribution the water samples (isotopically and chemically homogeneous by nature) were filtered and acidified. The mineral and rock samples were crushed, milled and mixed using the quartering technique. Boron isotopic ratio and concentration measurements on individual fragments of the starting materials, as well as on the milled materials, proved that the intercomparison samples are isotopically homogeneous, not only as a consequence of milling and mixing, but also because the starting substances were themselves quite homogeneous. Further homogeneity tests on four of the solid materials at the nanogram or smaller sampling size using SIMS and EPMA indicate that both the tourmaline B4 and the obsidian B6 are potentially good reference materials for future in situ microanalyses of boron isotopes. The materials prepared for this intercomparison of boron isotope and concentration results are now available at IAEA for distribution. (literal)

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Sonia Tonarini, Maddalena Pennisi, Alessandra Adorni-Braccesi, Andrea Dini, Giorgio Ferrara:Istituto di Geoscienze e Georisorse, Area di Ricerca del CNR, Via G. Moruzzi 1, I-56124 Pisa; Michael Wiedenbeck:GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany. Manfred Gröning:International Atomic Energy Agency, Division of Physical and Chemical Sciences, Wagramerstrasse 5, P.O. Box 100, A-1400 Vienna, Austria (literal)

Titolo

Intercomparison of Boron isotope and concentration measurements: Part I: Selection, preparation and homogeneity tests of the intercomparison materials. (literal)

Abstract

In 1999 the Istituto di Geoscienze e Georisorse (IGG), with the support of the International Atomic Energy Agency (IAEA), undertook the collection, preparation and distribution of eight geological materials intended for a blind interlaboratory comparison of measurements of boron isotopic composition and concentration. The materials come from Italian sources and consist of three natural waters (Mediterranean seawater and two groundwaters) and five rocks and minerals (tourmaline, basalt, obsidian, limestone and clay). The solid materials were crushed, milled and mixed, in preparation for distribution. Extensive assays performed at IGG on these materials demonstrate that their boron isotopic and chemical compositions are homogeneous. Additional homogeneity tests were carried out on solid material fragments at the GeoForschungsZentrum Potsdam, with the specific objective of investigating the suitability of some of them for the calibration in situ of micro-analytical techniques. Two materials, B4, tourmaline, and B6, obsidian, proved to be isotopically homogeneous and may become excellent references for in situ microanalyses of boron. The materials described here were used as the basis of a major laboratory intercomparison study and are now available for further distribution from either the IAEA (solid materials) or the IGG (waters). (literal)

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