Results 231 to 240 of about 68,774 (280)
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Sources and Isotopic Composition of Atmospheric Sulfur
Science, 1961In nonindustrial areas the prime source of SO--4in rain and snow is atmospherically oxidized H2S that is produced predominately along coastal belts by anaerobic bacteria. The δ S34analyses of atmospheric SO--4vary from +3.2 to +15.6 per mil in contrast to +20.7 per mil for sea water SO--4.
M L, Jensen, N, Nakai
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The isotopic composition of plant sulfur
Organic Geochemistry, 1980Abstract The isotopic composition of sulfur has been studied in plants representative of various regions of the U.S.S.R., two oceanic islands, and atmospheric precipitations on land and in marine areas. In soils, the isotopic composition of sulfur in the atmospheric water varies as a result of sulfate reduction (increase of δ 34 S of the soil sulfate)
F.V. Chukhrov +3 more
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Sulfur Isotope Fractionation in the Biogeochemical Sulfur Cycle of Marine Sediments
Isotopes in Environmental and Health Studies, 2001Abstract The sulfur isotopic record of sedimentary sulfides (mainly pyrite) and sulfates shows considerable variations in time and plays an important role in the biological and geochemical interpretation, e.g., of the evolution of life and the oxygen partial pressure of Earth's atmosphere (e.g. [1]).
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Sulfur isotopes and ore deposits
Economic Geology, 1960A geochemical history of the sulfur isotopes in the crust of the earth is presented. New measurements of the S³²/S³⁴ ratio on sulfide minerals are used to show that transport and depositional processes do not appear to produce appreciable variation in the relative abundance of the sulfur isotopes.
Wayne Urban Ault, J. Laurence Kulp
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Centrifugal enrichment of sulfur isotopes
Journal of Radioanalytical and Nuclear Chemistry, 2013This work contains the results of the research for the complete cycle of the centrifuge enrichment process of all sulfur isotopes. As a result of this work there was obtained, and made available (by centrifuge enrichment process), for the first time hundreds of grams of all the isotopes of sulfur to high enrichment.
A. N. Cheltsov +6 more
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Preparation of isotopic sulfur targets
Nuclear Instruments and Methods, 1977Abstract An evaporation technique for making sulfur isotope targets of approximately 200 μg/cm2 in thickness or greater is discussed.
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Sulfur Isotopes in Stromatolites
2011Intense biological sulfur cycling characterizes modern marine microbial mats as well as their ancient counterparts – stromatolites. Respective microbially driven processes, such as bacterial sulfate reduction, sulfide oxidation, or the disproportionation of sulfur-bearing compounds of intermediate oxidation states, are associated with distinctive and ...
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Physical Review, 1958
A new isotope of sulfur, ${\mathrm{S}}^{38}$, has been produced by the ($\ensuremath{\alpha}, 3p$) reaction on ${\mathrm{Cl}}^{37}$. It was found to have a half-life of 172\ifmmode\pm\else\textpm\fi{}1 minutes, and to decay by the emission of two beta groups with end-point energies of 1.1 and 3.0 Mev.
D. R. Nethaway, A. A. Caretto
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A new isotope of sulfur, ${\mathrm{S}}^{38}$, has been produced by the ($\ensuremath{\alpha}, 3p$) reaction on ${\mathrm{Cl}}^{37}$. It was found to have a half-life of 172\ifmmode\pm\else\textpm\fi{}1 minutes, and to decay by the emission of two beta groups with end-point energies of 1.1 and 3.0 Mev.
D. R. Nethaway, A. A. Caretto
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Sulfur isotopes and mineral paragenesis
Economic Geology, 1957Almost all of the previous investigations of S 32 /S 34 ratios of sulfide minerals and ores have indicated a lack of significant variations in the ratios of specimens collected from one deposit. Most of these valuable previous studies have been done by non-geologists upon, unfortunately, limited and poorly representative mineral suites of sulfide ...
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