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Interlaboratory Tests of X-Ray Quantitative Phase Analysis

Published online by Cambridge University Press:  10 January 2013

J. Dyakonov ,
K. Mishchenko ,
A. Hering ,
G. Unger ,
J. Korecký ,
K. Melka ,
J. Zoubková ,
N. Raynov ,
N. Thekhlanova  and
G. Rischák
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J. Dyakonov
Affiliation:
Geological Institute, 74 Srednyj pr., Saint-Petersburg 199026, Russia
K. Mishchenko
Affiliation:
Geological Institute, 74 Srednyj pr., Saint-Petersburg 199026, Russia
A. Hering
Affiliation:
Central Geological Institute, Invalidenstrasse 44, PF116, Berlin 1040, Germany
G. Unger
Affiliation:
Central Geological Institute, Invalidenstrasse 44, PF116, Berlin 1040, Germany
J. Korecký
Affiliation:
Geoindustria, Dr. Janskeho 19, 25228 Cernosice, Czechoslovakia
K. Melka
Affiliation:
Geological Survey, Malostranske n. 19, Prague, Czechoslovakia
J. Zoubková
Affiliation:
Geological Survey, Malostranske n. 19, Prague, Czechoslovakia
N. Raynov
Affiliation:
Geological Enterprise for Laboratory Research, Nasir Street 16, Sofia 1113, Bulgaria
N. Thekhlanova
Affiliation:
Geological Enterprise for Laboratory Research, Nasir Street 16, Sofia 1113, Bulgaria
G. Rischák
Affiliation:
Hungarian State Geological Institute, Nepstadion ut.14, Budapest XIV, Hungary
G. Sidorenko
Affiliation:
Institute of Mineral Resources, 31 Staromonetny per., Moscow 109017, Russia
M. Volkov
Affiliation:
Institute of Mineral Resources, 31 Staromonetny per., Moscow 109017, Russia
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Abstract

The results of an international project involving five countries and seven laboratories performing over 400 analyses for testing the interlaboratory reproducibility and accuracy using quantitative powder diffraction are presented in this report. Four natural and four artificial mineral mixtures were examined. The RIR (reference intensity ratio) values for all mineral components were either measured or calculated. The relative standard deviation of the interlaboratory determinations range from 5 to 20 percent (for low concentrations, the relative standard deviations can attain 60% percent). Due to systematic errors, the relative standard deviations of the interlaboratory determinations generally exceed the standard deviations determined by individual laboratories. The best results were obtained when the RIR values were measured independendy in each laboratory.

Type
Research Article
Information
Powder Diffraction , Volume 7 , Issue 3 , September 1992 , pp. 137 - 141
Copyright
Copyright © Cambridge University Press 1992

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