摘要:

World‐wide intercomparison runs has made possible the certification of two new Polish geological‐environmental reference materials for multi‐element trace analysis: Apatite Concentrate (CTA‐AC‐1) and Fine Fly Ash (CTA‐FFA‐1). “Recommended values’ are established for 25 (CTA‐AC‐1) and 40 (CTA‐FFA‐1) elements respectively. In addition, “information values’ are assigned for 12 elements in CTA‐AC‐1 and 10 elements in CTA‐FFA‐1. Our method of data evaluation has been further improved and a modified version of criteria for assigning recommend

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00110.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The zirconium content of 31 geochemical reference samples has been determined by a spectrophotometric method with Xylenol orange after sample decomposition by acid digestion and alkali fusion. The agreement between the present results and published data is generally good.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00111.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Using a recently published compilation of analytical data on reference samples SY‐2, SY‐3 and MRG‐1 as an example, a case is presented in favor of more precise terminology in describing analytical methods used in reporting data in collaborative programs. The technique of final measurement in a particular method is often less important than earlier operations, such as sample attack or technique of separ

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00112.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The silver content of seventy‐three geochemical reference samples has been determined by atomic absorption spectrometry using an air‐acetylene flame or a graphite furnace atomizer, after extraction of silver as iodide with methyl isobutyl ketone (MIBK). A comparison with published data shows clearly the need for much more data on most reference samp

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00113.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Concentration data on up to 91 individual constituents in USGS DTS‐1, G‐1, PCC‐1, and W‐1 have been collected from 1647 journal articles and technical reports. These data are summarized in consensus (mean) values with uncertainties expressed as one standard deviation. Mean values are also calculated as a function of analytical procedure and all raw data are given in the tables. Recommended values are proposed based upon data criteria used by NIST (National Institute of Standards and Technology, formerly the National Bureau of Standrds

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00114.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Fourteen rare‐earth (plus scandium and yttrium) orthophosphates have been synthesized and characterized for use as electron microprobe reference samples. These reference samples are single‐element phosphates that are homogeneous, stable under the electron beam, and free of interfering elements. They have a stoichiometric composition (RPO4) with the element of interest (R) ranging from 32 to 64 weight perc

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00115.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00116.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00117.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00118.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1991.tb00119.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY