摘要:

This report describes the preparation, analysis and certification of South African Reference Materials (SARMs) 39 to 52. These materials, which comprise a suite of rock materials originally named SAROCs, were collected from many locations within the Republic of South Africa. Nineteen laboratories in five countries used a variety of analytical techniques to provide the analytical results. The certified and tentative values that have been assigned to a number of constituents are presented in tabular form in appendices.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00130.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Three new reference materials were manufactured for calibration of relative stable nitrogen‐isotope‐ratio measurements:USGS25 (ammonium sulfate) δ615″=−30 per milUSGS26 (ammonium sulfate) δ615″=+54 per milUSGS32 (potassium nitrate) δ615″=+180 per milwhere δN′, relative to atmospheric nitrogen, is an approximate value subject to change following interlaboratory comparisons. These materials are isotopically homogeneous in aliquots at least as small as 10 pot N, (or about 1‐2 mg of salt). The new reference materials greatly extend the range of δ15N values of internationally distributed standards, and they allow normalization of δ15N measurements over almost the full range of known natural isotope variation on Earth. The methods used to produce these materials may be adapted to produce homogeneous local laboratory stan

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00131.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00132.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Book Reviewed in this article:Geochemical Reference Material Compositions: rocks, minerals, sediments, soils, carbonates, refractories and ores used in research and industry by P.J. POTI'S, A.G. TINDLE and P.C. WEBB

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00133.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00134.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1993.tb00135.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY