摘要:

The U.S. Geological Survey has prepared an attapulgite and a bentonite as reference samples because of their economic importance. The attapulgite (ATT‐1) is from the Meigs‐Attapulgite‐Quincy fuller's earth district of Georgia and Florida, and the bentonite (CSB‐1) is from the Northern Black Hills bentonite district of Wyoming, Montana, and South Dakota. The chemical and mineralogical properties of these two samples are quite different. Provisional values calculated from the few analytical data and the X‐ray diffraction mineralogy are presented for those who wish to use the clays as referenc

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00001.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Three base‐metal concentrates, each weighing 25 kg, were ground to ‐175 mesh (90 μm) and homogenised. They were then sub‐sampled into foil‐lined envelopes and sealed under argon before being issued to 27 participating laboratories for analysis. Over 4000 analytical results were returned and, after evaluation, a total of 37 elements within the three samples have been given recommended or more cautious probable values. The high standard of precision attained has enabled clear‐cut distinctions to be made between methods for the determination of some elements. The most important of these is between titrimetry and electrogravimetry in the determination

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00002.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

An outline is given of a three‐week lecture tour in China, including visits to Beijing, Langfang, Wuhan and Nanjin

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00003.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Nineteen USGS GRSs were analyzed with a Dupont 903‐H Moisture Analyzer at 110°C and 1000°C to obtain H2O‐and H2O+, and by thermal neutron induced gamma‐ray spectrometry to obtain total H2O. The values are compared with the current literature and the two techniques evaluated. Except for QLO‐1 by coulometry, no significant differences were obtained when the results were compared to the the l

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00004.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Iron (II) oxide in 50 mg samples of silicate rocks, deposits, and soils is measured after digestion with HF and HCl in the presence of ICl. The iodine produced is measured spectrophotometrically. Results are presented for the eighteen available USGS geochemical reference standards including the GXR series.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00005.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Eleven USGS geological reference materials and twelve French geological reference materials have been measured for B, Sm and Gd concentrations by prompt‐gamma activation analysis. For those materials that have already been analysed, our data is in agreement with published recommended values. These values constitute the first measured data for several French geological reference materia

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00006.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Nine rare earth elements have been determined by inductively coupled plasma spectrometry (ICP) in eight USGS reference samples, MAG‐1, SCo‐1, SDC‐1, BIR‐1, DNC‐1, W‐2, BCR‐1 and BHVO‐1 and in the ANRT Glauconite, GL‐O. Along with these new data, updated compilations are presented for these samples. Good agreement is observed between the present work and th

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00007.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Twenty‐eight major, minor and trace elements in nine new rock reference samples of Geological Survey of Japan (GSJ), JA‐2, JA‐3 JB‐1a, JG‐1a, JG‐2, JG‐3, JF‐1, JF‐2 and JP‐1 have been determined using atomic absorption spectrometry, flame emission spectrometry and wet

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00008.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Eighteen new Chinese standard reference samples (including stream sediments, soils and rocks) have been analysed by an automated proton induced gamma ray emission (PIGE) method for fluorine. Results of determinations are reported and are generally in good agreement with the “usable values” previously publis

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00009.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

A continuous‐flow hydride atomic absorption spectrophotometric method has been applied to 32 geochemical reference materials for the determination of selenium. The sample is decomposed with a mixture of nitric, perchloric and hydrofluoric acids. Selenium values obtained in this study are in general agreement with literature values and provide additional certification for these reference materials. The precision of the method is generally better than 5% relative standard deviation. The lower limit of determination of selenium in the sample is 12 pp

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1987.tb00010.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY