TRACE ELEMENT DETERMINATIONS IN NATURAL MATERIALS BY ACTIVATION ANALYSIS

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Abundances of zirconium, hafnium, cadmium, antimony, tantalum, gold, platinum, and iridium have been determined in meteorites, tektites, deep-sea sediments, and various terrestrial materials by use of neutron activation analysis. Among the principal advantages of the method are its high sensitivity and freedom from errors due to reagent and laboratory contamination. These data have considerable significance in the fields of geochemistry and cosmochemistry. Each of these elements, except platinum, is separated after irradiation from the sample matrices by use of carriers and specific radiochemical separation techniques. Gold and platinum are determined simultaneously by separating and counting only gold. This is possible ... continued below

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Pages: 22

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Ehmann, W D January 1, 1963.

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Abundances of zirconium, hafnium, cadmium, antimony, tantalum, gold, platinum, and iridium have been determined in meteorites, tektites, deep-sea sediments, and various terrestrial materials by use of neutron activation analysis. Among the principal advantages of the method are its high sensitivity and freedom from errors due to reagent and laboratory contamination. These data have considerable significance in the fields of geochemistry and cosmochemistry. Each of these elements, except platinum, is separated after irradiation from the sample matrices by use of carriers and specific radiochemical separation techniques. Gold and platinum are determined simultaneously by separating and counting only gold. This is possible due to the decay of the irradiation- produced Pt/sup 199/ to its radioactive daughter, Au/sup 199/. Gamma-ray scintillation spectrometry allows selective counting of the Au/sup 199/ produced from the irradiation of gold and the Au /sup 199/ produced indirectly from the irradiation of platinum in the samples. All abundances are computed by comparison of gamma-ray counting rates of the extracted samples with the counting rates of standard samples of each element irradiated simultaneously. Certain of the abundance data for chondritic meteorites as determined in this work, including zirconium at 34 ppm, gold at 0.22 ppm, iridium at 0.49 ppm, and tantalum at 0.02 ppm, are in good agreement with the relatively few previous determinations found in the literature. However, other abundances, such as hafnium at 0.19 ppm in chondrites, are substantially different from previously reported data. The significance of these data as related to theories of meteorite formation and nucleosynthesis in the stars is briefly discussed. (auth)

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Pages: 22

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  • XIXth International Congress of Pure and Applied Chemistry, London, England, July 10 - 17, 1963

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  • Report No.: CONF-151-4
  • Grant Number: AT(40-1)-2670
  • Office of Scientific & Technical Information Report Number: 4104027
  • Archival Resource Key: ark:/67531/metadc868942

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  • January 1, 1963

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 31, 2016, 3:16 p.m.

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Ehmann, W D. TRACE ELEMENT DETERMINATIONS IN NATURAL MATERIALS BY ACTIVATION ANALYSIS, article, January 1, 1963; United States. (digital.library.unt.edu/ark:/67531/metadc868942/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.