LYCOS RETRIEVER 
Isotope: Carbon
built 285 days ago
Isotopic compositions are determined in specialized laboratories using isotope ratio mass spectrometry. The analytical precisions are small relative to the ranges in d values that occur in natural earth systems. Typical one standard deviation analytical precisions for oxygen, carbon, nitrogen, and sulfur isotopes are in the range of 0.05‰ to 0.2‰; typical precisions for hydrogen isotopes are poorer, from 0.2 to 2.0‰, because of the lower 2H:1H ratio.
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Carbon isotope profiles from all three sections show that a lower positive carbon isotope excursion of lesser magnitude is present in the strata between the Deicke and Millbrig K-bentonites, and immediately overlying strata (figs. 2, 3, and 4). This lower positive
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This chemical difference is put to use by scientists in the technique of kinetic isotope effects. Besides hydrogen and its isotope deuterium, researchers use the isotopes of boron, oxygen, nitrogen and carbon.
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Carbon