02292naa a2200277 a 450000100080000000500110000800800410001902400500006010000170011024502070012726000090033452013790034365000180172265000130174065000190175365000120177265300170178465300130180165300140181470000170182870000230184570000180186870000290188670000180191577300810193320981322018-10-24       2018    bl uuuu     u00u1 u    #d7 a10.30744/brjac.2179-3425.2018.5.19.38-532DOI1 aTAUBE, P. S.  aExploratory on-line pyrolysis and thermally assisted hydrolysis and methylation for evaluating non-hydrolyzable organic matter in anthropogenic soil from Central Brazilian Amazon.h[electronic resource]  c2018  aAmazonian dark earths (ADE) are characterized by high fertility and organic carbon content, the latter being associated with black carbon (BC). BC is recalcitrant in nature due to its aromatic building blocks and it is expected to remain in the non-hydrolyzable fraction after the sequential extraction of soil organic matter (SOM). In this context, the aim of this study was to compare the composition of non-hydrolyzable SOM samples from an ADE and an adjacent soil using pyrolysis - gas chromatography - mass spectrometry and thermally-assisted hydrolysis and methylation with tetramethylammonium hydroxide. We tested two hypotheses: (i) non-hydrolyzable organic matter preserves BC in ADE and adjacent soils; and (ii) pyrolysis products are also produced thermally and are different for ADE and adjacent soils. The results of this study showed that polycyclic aromatic hydrocarbons were the main pyrolysis products for both soils. In addition, the benzene / toluene, naphthalene / methylnaphthalene and benzofuran / methylbenzofuran ratios of the pyrolysis products observed in the case of ADE were around two times higher than the corresponding values for the adjacent soil, except in the surface horizon, which indicates the presence of a higher recalcitrant BC in the ADE. The specific organic matter sources for the ADE and adjacent soil could not be differentiated.  aCarbonization  aCharcoal  aCarbonização  aCarvão  aBlack carbon  aPy-GC-MS  aTHM-GC-MS1 aSILVA, D. S.1 aVASCONCELOS, A. A.1 aREBELLATO, L.1 aMADEUREIRA, L. A. dos S.1 aHANSEL, F. A.  tBrazilian Journal of Analytical Chemistrygv. 5, n. 19, p. 38-53, Jan. 2018.