Fraction of Sulfur Isotopes during Reduction
نویسندگان
چکیده
منابع مشابه
Fractionation of Sulfur and Oxygen isotopes during SO2 photolysis
The discovery of sulfur mass-independent fractionation (S-MIF) in ancient sedimentary rocks [1] has created the opportunity for quantitative constraints on the composition of the early atmosphere. Laboratory experiments have shown that S-MIF occurs during SO2 photodissociation at a variety of UV wavelengths [2, 3]. The source of the S-MIF in experiments at wavelengths ~ 200 nm is self-shielding...
متن کاملInterstellar Sulfur Isotopes and Stellar Oxygen Burning
line survey has been made to study interstellar 32 S= 34 S and 34 S= 33 S ratios from the galactic disk. The four CS isotopomers were detected in 20 star forming regions with galactocentric distances between 3 and 9 kpc. From a comparison of line velocities, the C 33 S J=2{1 rest frequency is 250 kHz below the value given in the Lovas (1992) catalog. Taking 12 C= 13 C ratios from Wilson & Rood ...
متن کاملSedimentary sulfur isotopes and Neoarchean ocean oxygenation
Abrupt disappearance of mass-independent fractionation of sulfur isotopes (MIF-S) from the geologic record and an apparent ingrowth in seawater sulfate around 2.45 billion years ago (Ga) signal the first large-scale oxygenation of the atmosphere [the Great Oxygenation Event (GOE)]. Pre-GOE O2 production is evident from multiple other terrestrial and marine proxies, but oceanic O2 concentrations...
متن کاملPhysiology of Multiple Sulfur Isotope Fractionation during Microbial Sulfate Reduction
Microbial sulfate reduction (MSR) utilizes sulfate as an electron acceptor and produces sulfide that is depleted in heavy isotopes of sulfur relative to starting sulfate. The fractionation of S-isotopes is commonly used to trace the biogeochemical cycling of sulfur in nature, but a mechanistic understanding of factors that control the range of isotope fractionation is still lacking. This thesis...
متن کاملPatterns of sulfur isotope fractionation during microbial sulfate reduction.
Studies of microbial sulfate reduction have suggested that the magnitude of sulfur isotope fractionation varies with sulfate concentration. Small apparent sulfur isotope fractionations preserved in Archean rocks have been interpreted as suggesting Archean sulfate concentrations of <200 μm, while larger fractionations thereafter have been interpreted to require higher concentrations. In this wor...
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1958
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.31.496