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Published online 11 January 2008
Published in Soil Sci Soc Am J 72:258-267 (2008)
DOI: 10.2136/sssaj2007.0031
© 2008 Soil Science Society of America
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Direct Detection of Black Carbon in Soils by Py-GC/MS, Carbon-13 NMR Spectroscopy and Thermogravimetric Techniques

J. M. De la Rosaa,*, H. Knickerb, E. López-Capelc, D. A. C. Manningc, J. A. González-Perezd and F. J. González-Vilad

a IRNAS-CSIC, Reina Mercedes Av. 10, Seville 41012, Spain
b Lehrstuhl für Bodenkunde, Technische Universitat Muchen, D-85350 Freising-Weihenstphan, Germany
c Manning, School of Civil Eng. and Geosciences, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK
d IRNAS-CSIC, Reina Mercedes Av. 20, Seville 41012, Spain


Figure 1
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  		Fig. 1. Weight loss Thermograms (TG) and differential scanning calorimetric (DSC) curves of samples within the range from 40 to 800°C.

 

Figure 2
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  		Fig. 2. {delta} 13C values of studied samples measured at 300, 350, 420, 450, 520, and 550°C during thermal degradation as measured by Thermogravimetry-Isotopic Ratio Mass Spectrometer (TG-IRMS).

 

Figure 3
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  		Fig. 3. Total ion chromatograms Pyrolysis-Gas chromatography/mass spectroscopy. The numbers over the peaks refer to compounds listed in Table 3. Flash pyrolysis of the samples was carried on at 500°C. The desorption step (280°C) was achieved on Mediterranean soil samples before the pyrolysis step.

 

Figure 4
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  		Fig. 4. Solid state 13C NMR spectra of artificially charred materials (wood char and grass char), reference soils (mollisol and vertisol) and Mediterranean soils (control and burnt soil).

 




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