Blank Corrections for Ramped Pyrolysis Radiocarbon Dating of Sedimentary and Soil Organic Carbon

2014 ◽  
Vol 86 (24) ◽  
pp. 12085-12092 ◽  
Author(s):  
Alvaro Fernandez ◽  
Guaciara M. Santos ◽  
Elizabeth K. Williams ◽  
Matthew A. Pendergraft ◽  
Lael Vetter ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Radiocarbon Dating ◽  
Ramped Pyrolysis

14C Dating of Soil Organic Carbon (SOC) in Loess-Paleosol Using Sequential Pyrolysis and Accelerator Mass Spectrometry (AMS)

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 563-570 ◽  
Author(s):  
Peng Cheng ◽  
Weijian Zhou ◽  
Hong Wang ◽  
Xuefeng Lu ◽  
Hua Du
Keyword(s):  
Mass Spectrometry ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Pyrolysis Temperature ◽  
Chemical Extraction ◽  
14C Dating ◽  
New Approach ◽  
Soc Fractions

The chemical extraction of soil organic carbon (SOC) fractions from soils often does not produce satisfactory results for radiocarbon dating. In this study, a sequential pyrolysis technique was investigated. The soil was pyrolyzed at temperatures of 200, 400, 600, and 800 °C to partition organic carbon into pyrolytic volatile (Py-V) and pyrolytic residue (Py-R) fractions. The preliminary results show that the 14C dates of both fractions become progressively older as the pyrolysis temperature is increased. In addition, the ages of the Py-V fractions are consistently younger than the corresponding Py-R fractions extracted at the same temperature. Experimental results of known-age paleosol samples indicate that the Py-V fractions obtained between 600 and 800 °C yield the most reliable ages. This technique provides a new approach to improve the accuracy of 14C dating of loess-paleosol sequences.

Early responses of vegetation and soil organic carbon to waterlogging and winter wildfire on abandoned red paddy soils

2014 ◽  
Vol 38 (6) ◽  
pp. 626-634
Author(s):  
TIAN Wen-Wen ◽  
◽  
WANG Wei ◽  
CHEN An-Lei ◽  
LI Yu-Yuan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Paddy Soils
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