摘要:

Twenty seven geochemical reference samples have been analysed for cadmium using the stable isotope dilution technique. These include four USGS, one NBS, five CRPG, eleven ANRT and six NIMROC samples. Each sample has been analysed at least in duplicate.The four USGS samples have previously been measured in this laboratory by Rosman and De Laeter, but the present results are believed to be more accurate than the earlier data. Our results for the other twenty three samples are much lower than most of the published data. There is also evidence of cadmium inhomogeneities in some of the samples.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

The uranium contents of thirteen rock reference samples from the Centre de Recherches Pétrographiques et Géochimiques, Nancy, France, were determined by delayed‐neutron activation analysis. Four others from the same laboratory were found to have uranium concentrations below our limit of detection. Meaningful comparison of our data with other workers is presently not possible (i) because of the paucity of uranium data and (ii) because of the disparity of uranium data on the samples for which uranium data ex

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

The molybdenum and tungsten contents of 40 geochemical reference samples have been determined by a spectrophotometric procedure. The agreement between the present results and published data is generally good.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Sixteen international and six inter‐laboratory geochemical reference samples have been analysed for their selenium content. No previous Sedata are available for thirteen of them. Selenium has been separated from silicate matrix by volatilization and was determined with flameless atomic absorption spectrometry. An outline of the procedure is given. The limit of detection is 10 ng Se per 1 g of sample. Time required for one full analysis is 1.2 to 2.5 hours depending on amount of sample to be volatilize

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Geostandards are needed to intercalibrate environmental research and routine environmental monitoring programs. Because a principal concern in both types of analyses is the elemental concentrations of discrete phases, values for partial extractions of geostandards are also needed. This and other information are solicited for an intercalibration among laboratories which monitor metals in marine sediments and wastewater sludge.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00266.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

An international iron‐formation reference sample is warranted as a basis for geochemical investigations of Precambrian iron‐formations. A better knowledge of the geochemistry of iron formations will hopefully elucidate the long standing discussion on the genesis of iron‐formations. The reference sample can furthermore be used in studies of deep‐sea metalliferous d

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00267.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Ayant eu à ré‐étalonner sur une base euro‐péenne des lots de deux minerais de fer et d'un laitier de haut fourneau préalablement étalonnés uniquement par des laboratoires français, il y a 6 à 10 ans, on a pu montrer que:‐les moyennes certifiées n'ont pas évoluées,‐ que les dispersions de mesure se sont réduites,‐ que l'absorption atomique permet de doser correctement les très basses teneurs en Ca et Mg dans les

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00268.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Après avoir décrit la structure du laboratoire d'analyse de l'IRSID à Maizières‐lès‐Metz, en abordant les éléments dosés par spectrométrie de fluorescence X et l'absorption atomique, les auteurs passent en revue les méthodes chimiques dans le cadre de l'analyse des minerais de fer.Quelques informations sont données sur l'activité au sein de l'ISO/TC 102/SC1 puis le point est fait sur les matériaux de référence certifiés actuellement connus dans le monde.Si le laboratoire comporte comme équipement de base un spectromètre de fluorescence X associéà diverses autres techniques qui devraient peu évoluer dans le futur, il semble qu'à l'avenir une bonne place soit réservée pour les minerais tout comme pour bien d'autres matrices, à la spectrométrie

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00269.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

By mixing1H2O and2H2O, both with accurately known purity, samples were prepared with2H/1H ratios close to those of the international isotopic water standards: V‐SMOW and SLAP. A mass spectrometrical comparison of these calibration samples with the actual water standards revealed:2H/1H of V‐SMOW = (155.95 ± 0.08) × 10−62H/1H of SLAP = (89.12 ± 0.07) × 10−6δ2HV‐SMOW(SLAP)

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00270.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Eight reference samples from the U.S. Geological Survey have been analysed for their contents of F, Cl and water. After pyrolysis F was determined with an ion‐selective electrode, Cl by colorimetry and water by Karl‐Fischer titrat

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1980.tb00271.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY