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- W2048420285 abstract "Abstract Radiocarbon ( 14 C) dating of total soil organic matter (SOM) often yields results inconsistent with the stratigraphic sequence. The onerous chemical extractions for SOM fractions do not always produce satisfactory 14 C dates. In an effort to develop an alternative method, the pyrolysis-combustion technique was investigated to partition SOM into pyrolysis volatile (Py-V) and pyrolysis residue (Py-R) fractions. The Py-V fractions obtained from a thick glacigenic loess succession in Illinois yielded 14 C dates much younger but more reasonable than the counterpart Py-R fractions for the soil residence time. Carbon isotopic composition (δ 13 C) was heavier in the Py-V fractions, suggesting a greater abundance of carbohydrate- and protein-related constituents, and δ 13 C was lighter in the Py-R fractions, suggesting more lignin- and lipid-related constituents. The combination of 14 C dates and δ 13 C values indicates that the Py-V fractions are less biodegradation resistant and the Py-R fractions are more biodegradation resistant. The pyrolysis-combustion method provides a less cumbersome approach for 14 C dating of SOM fractions. With further study, this method may become a useful tool for analyzing unlithified terrestrial sediments when macrofossils are absent." @default.
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- W2048420285 date "2003-07-01" @default.
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- W2048420285 title "Pyrolysis-combustion <sup>14</sup>C dating of soil organic matter" @default.
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- W2048420285 doi "https://doi.org/10.1016/j.yqres.2003.07.004" @default.
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