摘要:

Publication patterns of NBS, USGS and CCRMP reference materials data are traced over the past 35 years by literature source, analytical methods employed, and constituents measured.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00019.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Results of fluorine determinations by a pyrohydrolysis‐ion selective electrode method are reported for four reference coals, two fly ashes and eight rock samples. These values were obtained during a study of Australian coals which showed that the standard oxygen bomb combustion method generally used for coals gives low results. The results are compared with available literature data for these reference samples which were obtained by a variety of method

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00020.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Les teneurs de huit éléments des terres rares (La, Ce, Nd, Sm, Eu, Tb, Yb, Lu) sont déterminées par l'analyse par l'activation neutronique instrumentale sur l'Echantillon Géochimique de Référence NBS 88a. Ces teneurs proviennent de la moyenne arithmétique de dix analyses de NBS 88a. Elles se comparent bien avec d'autres déterminations de ces éléments publiées dans la littérature. Dans la limite de la précision analytique, NBS 88a paraît homogène en ce qui concerne l

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00021.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Four mafic USGS rock standards (BHVO‐1, BIR‐1, DNC‐1, BCR‐1) were analyzed at three sample sizes (1, 5, and 10 g) for gold by neutron activation analysis subsequent to fire‐assay concentration. The results indicate that large samples, in the order of 10 g, are required to produce consistent results, although analyses of variance indicate that sample sizes of 5 g may be used effectively. The analysis of 1 g samples resulted in a large range of values and high standard deviations. BCR‐1 was found to be the most homogeneous of the four standards for gold, followed in decreasing order by BIR‐1, DNC‐1, and BHVO‐1. Data for Ir in BIR‐1 and DNC

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00022.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

During the five‐year period (April 1981 ‐ March 1986), a series of fifteen rock reference samples, “Igneous rock series”, has been prepared by the Geological Survey of Japan (GSJ). Based on the data available (published and communicated), consensus values for major, minor and trace elements have been derived; these values are presented for this second series of samples as well as for the first series of two samples, Granodiorite JG‐1 and Ba

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00023.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Boron concentration data on 69 different biological, coal and geological reference materials issued by NBS, USGS and CCRMP have been collected from 1951‐1986. Data from 135 journal articles and technical reports are included. These data are summarized in consensus (mean) values with uncertainties expressed as pm one standard deviation. Mean values are also calculated as a function of analytical procedure and all raw data are given in the table

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00024.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Nickel in the six SA primary (NIMROCS) and fourteen secondary reference materials as well as in a phosphate rock has been determined accurately by means of atomic absorption spectrometry. A selective and quantitative twocolumn ion exchange separation procedure, using AG50W‐X4 cation exchange resin, is employed for the separation of nickel from all other elements. The accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of nicke

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00025.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Concentrations of twelve trace elements (Cr, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, La and Ce) in eight Chinese stream‐sediment reference samples have been determined by energy‐dispersive X‐ray fluorescence spectrometry. The samples were analyzed directly and non‐destructively in loose powder form. Compton scatter radiation was used as an internal standard to compensate for variations in sample matrix, particle size, packing density, and instrumental operating characteristics. The results agree well with the Chinese recommended

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00026.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

A microprobe reference sample was made from a portion of a large and homogeneous single crystal of augite which contains 0.85% of Cr2O3. The relatively high chromium content of this augite increases its usefulness as a microprobe reference sample.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00027.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Lead‐210, radium‐226, thorium‐228 and uranium‐238 concentrations have been determined in five CCRMP reference samples using direct gamma‐ray spectrometry. Literature data are available for only lead‐210 and radium‐226 levels in

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00028.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY