Results 241 to 250 of about 65,167,055 (305)
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Nature, 1979
A basic approach used in estuarine chemistry is to determine the experimental distribution of one given element with chlorinity and compare it with that predicted from the simple mixing of river water with seawater. This method provides useful results but several practical problems arise—including the definition of correct end-members, the role of ...
J. M. Martin, R. Letolle
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A basic approach used in estuarine chemistry is to determine the experimental distribution of one given element with chlorinity and compare it with that predicted from the simple mixing of river water with seawater. This method provides useful results but several practical problems arise—including the definition of correct end-members, the role of ...
J. M. Martin, R. Letolle
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Determination of oxygen-18 in inorganic compounds
Talanta, 1966A relatively simple and rapid method has been developed for the analysis of the oxygen-18 content of many inorganic compounds including water. The samples are heated with silver cyanide at 500 degrees and the carbon dioxide formed is separated from the other products by means of a methylcyclohexane slush at -130 degrees and analysed mass ...
B Z, Shakhashiri, G, Gordon
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Quantitative Determination of Oxygen-18 by Activation Analysis
Nature, 1963RADIOACTIVE isotopes of carbon and hydrogen are available for exchange and mechanism studies investigation in biology, but work on oxygen must use the stable isotopes oxygen-16 and -18. The ratio of these stable isotopes can be determined with mass spectrometer or density methods.
D E, SOLBERG +2 more
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Oxygen-18 Isotopic Studies of HOOO and DOOO
The Journal of Physical Chemistry A, 2017Owing to questions that still persist regarding the length of the O-H and central O-O bond, and large-amplitude torsional motion of trans hydridotrioxygen HOOO, a weakly bound complex between OH and O2, new 18O isotopic measurements of HOOO and DOOO were undertaken using Fourier transform microwave and microwave-millimeter-wave double resonance ...
Lou Barreau +5 more
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The Journal of Organic Chemistry, 1978
The possibility of oxygen isotope exchange between (/sup 18/O)H/sub 2/O and H/sub 2/O/sub 2/ in the presence of fluorosulfonic acid was reexamined, and the results are reported. The results indicated that under the given experimental conditions water was a good enough nucleophilic to cleave the O-O bond of H/sub 2/O/sub 2/ or its derivative.
Sung-Kee Chung, Philip Decapite
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The possibility of oxygen isotope exchange between (/sup 18/O)H/sub 2/O and H/sub 2/O/sub 2/ in the presence of fluorosulfonic acid was reexamined, and the results are reported. The results indicated that under the given experimental conditions water was a good enough nucleophilic to cleave the O-O bond of H/sub 2/O/sub 2/ or its derivative.
Sung-Kee Chung, Philip Decapite
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Oxygen-18 Composition of Oceanic Sulfate
Science, 1967Comparison of experimental data with analyses of oceanic sulfate indicates that oceanic sulfate is not in oxygen isotope equilibrium with ocean water. Preliminary experiments suggest that the turnover of sulfate in the sulfur cycle is too rapid to allow equilibrium to be established. If this is so, the sulfur cycle must exert a significant influence on
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