Determination of Indium and Tellurium in Fifty Nine Geological Reference Materials by Solvent Extraction and Graphite Furnace Atomic Absorption Spectrometry     

Shigeru Terashima 《Geostandards and Geoanalytical Research》2001,25(1):127-132

The indium (In) and tellurium (Te) contents of fifty nine geological reference materials, issued by several reference material producers (USGS, CRPG, ANRT, GIT-IWG and GSJ) have been determined by graphite furnace atomic absorption spectrometry, after aqua regia and HF digestion, and extraction of iodide complexes with trioctylmethylammonium (TOMA) - metyl isobutyl ketone (MIBK). Although the interferences from most elements can be minimised by the addition of palladium solution as the matrix modifier, large concentrations of Bi, Cu, Pb or Sn suppress the absorbance of In and/or Te. Samples for analysis were therefore restricted to those in which the concentrations of these interfering elements did not cause a significant interference. The limit of detection was 0.2 ng g⁻¹ In and Te for 1 g test portions. The agreement between the reported results and published data is satisfactory.  相似文献   

GOLD IN TWENTY-SIX JAPANESE GEOCHEMICAL REFERENCE SAMPLES     

Shigeru TERASHIMA  Shiro ITOH  Atsushi ANDO 《Geostandards and Geoanalytical Research》1992,16(1):9-10

Gold has been determined in 26 geochemical reference samples with graphite furnace AAS after digesting the samples with aqua regia and hydrofluoric acid and extracting gold by methyl isobutyl ketone (MIBK). This method yields clearly higher values than those by the partial attack using aqua regia digestion.  相似文献   

Fluorite Deposits at Voznesenka in the Khanka Massif, Russia: Geology and Age of Mineralization   总被引：1，自引：0，他引：1  

Kohei Sato  Kazuhiro Suzuki  Munetomo Nedachi    Shigeru Terashima    Margarita D. Ryazantseva    Anatoly A. Vrublevsky  + Alexander I. Khanchuk  ++ 《Resource Geology》2003,53(3):193-211

Abstract. A huge fluorite deposit at Voznesenka in the Khanka massif, Far East Russia is concluded to have formed at ca. 450 Ma in Late Ordovician time based on the K‐Ar ages for Li‐micas in the fluorite ore and greisenized leucogranite within the deposit. This conclusion is inconsistent with the current view of Devonian mineralization that stemmed from widely scattered whole‐rock Rb‐Sr isotope data for the heterogeneous leucogranite stocks influenced by strong alteration. The Voznesenka and neighboring fluorite deposits may have formed in Cambrian limestone in relation to the intrusion of the Li‐F‐rich felsic magma which has a similar chemistry to representative Li‐F‐rich felsic rocks including topaz granite and ongonite or topaz rhyolite; these rocks may be classified as a specific group of highly fractionated felsic magmas. Biotite granite plutons exposed in the Voznesenka district are divided in age into two groups based on the CHIME age data for zircon, monazite and xenotime: Ordovician and Permian. The Ordovician plutons seem to be coeval to the fluorite deposits and are characterized by F‐rich chemistry, reduced nature and association of tin mineralization with the deposition of fluorite and tourmaline. The biotite granite magmas of initially enhanced F contents could have been highly fractionated to form Li‐F‐rich leucogranite cupolas that provided fluorite deposits within the host limestone. Future prospecting for similar fluorite deposits is to be focused on areas of intersection between Ordovician Li‐F‐rich granite and Cambrian carbonate sequences. The Permian granite of southeastern margin of the Grodekovo batholith is characterized by lesser F content, oxidized nature and the lack of tin and fluorite mineralization in contrast to the Ordovician granite. The result of Permian age does not support the current view of Silurian age for the batholith and requires overall chronological reinvestigation in connection with the tectonic history of the Khanka massif because the Grodekovo is a representative of Paleozoic batholiths in Primorie.  相似文献   

The Preparation and Preliminary Characterisation of Four New Geological Survey of Japan Geochemical Reference Materials: Soils, JSO-1 and JSO-2; and Marine Sediments, JMS-1 and JMS-2   总被引：1，自引：0，他引：1  

Shigeru Terashima  Noboru Imai  Masahiro Taniguchi  Takashi Okai  Akira Nishimura 《Geostandards and Geoanalytical Research》2002,26(1):85-94

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Determination of Molybdenum in Fifty Three Geochemical Reference Materials by Flameless Atomic Absorption Spectrometry     

Shigeru Terashima 《Geostandards and Geoanalytical Research》1997,21(1):93-96

The molybdenum (Mo) contents of fifty three geochemical reference materials issued by ANRT, GIT-IWG, NIST and GSJ, have been determined by atomic absorption spectrometry, using a graphite furnace atomiser, after extraction of Mo dithiol with isoamyl acetate. Detection limits for this method (0.01 μg g⁻¹) are ten times smaller than for most classical methods. The agreement between the present results and published data is satisfactory.  相似文献   

1994 COMPILATION OF ANALYTICAL DATA FOR MINOR AND TRACE ELEMENTS IN SEVENTEEN GSJ GEOCHEMICAL REFERENCE SAMPLES, "IGNEOUS ROCK SERIES"   总被引：1，自引：3，他引：1  

Noboru IMAI  Shigeru TERASHIMA  Shiro ITOH  Atsushi ANDO 《Geostandards and Geoanalytical Research》1995,19(2):135-213

Analytical data for minor and trace elements published or communicated to us, on seventeen GSJ (Geological Survey of Japan) reference samples, "Igneous rock series" received up to April 1994 are compiled. The data were evaluated statistically in consideration of analytical methods. Based on the selected available data, 1994 recommended and proposed values for 65 minor and trace elements are presented.  相似文献   

TWO NEW GSJ GEOCHEMICAL REFERENCE SAMPLES: SYENITE JSY-1 AND MANGANESE NODULE JMN-1     

Shigeru TERASHIMA  Akira USUI  Noboru IMAI 《Geostandards and Geoanalytical Research》1995,19(2):221-229

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DETERMINATION OF TOTAL NITROGEN AND CARBON IN TWENTY-TWO SEDIMENTARY ROCK REFERENCE SAMPLES BY COMBUSTION ELEMENTAL ANALYZER     

Shigeru TERASHIMA 《Geostandards and Geoanalytical Research》1993,17(1):123-125

Total nitrogen and carbon have been determined in 22 sedimentary rock reference samples by combustion elemental analyzer. Satisfactory agreement is observed between the present study and the published values but much more data for nitrogen are required for better comparisons.  相似文献   

DETERMINATION OF MERCURY IN ONE HUNDRED AND EIGHTEEN GEOCHEMICAL REFERENCE SAMPLES BY COLD VAPOR ATOMIC ABSORPTION SPECTROMETRY     

Shigeru TERASHIMA 《Geostandards and Geoanalytical Research》1994,18(2):199-202

The mercury content of 118 geochemical reference samples have been determined by combustion followed by cold vapor atomic absorption spectrometry. The negative interference from volatile halogen and sulfur was eliminated by a packing of sodium carbonate in the combustion tube and addition of magnesium oxide to the samples. A comparison with published data show clearly the need for much more data on most reference samples.  相似文献   

Elasticity and anharmonicity of potassium chloride at high temperature     

Shigeru Yamamoto  Orson L. Anderson 《Physics and Chemistry of Minerals》1987,14(4):332-340

High temperature elasticity of single crystal potassium chloride has been studied by the Rectangular Parallelepiped Resonance (RPR) method up to 870 K (? 3.8 times the Debye temperature, ?). The elastic stiffness moduli, C ₁₁ and C ₄₄, decrease linearly with temperature while C ₁₂ increases slightly with temperature. The RPR method is particularly suited to measurements of elasticity at high temperatures, since no glues (which decompose at high temperature) are used to connect the transducers to a specimen. As a consequence, the measured spectrum closely approximates the theoretical spectrum of a specimen freely suspended in space with no external contact. The present elasticity data permits the investigation of the thermodynamic properties of potassium chloride far above the Debye temperature when used together with the previous zero-pressure data on thermal expansivity and heat capacity. The equation of state of potassium chloride is virtually unaffected by anharmonicity, even at T/?=3.8. One result is that the thermal pressure for KCl above the Debye temperature linearly increases with temperature. There is also small dependence on volume, in contrast to NaCl where there is no dependence on volume.  相似文献