In contrast to fatty acids, sorption of less hydrophobic analytes listed in Table 5 onto biochars is expected to be low, which is mainly due to the low specific surface area of the sorbents (Parshetti et al., 2013).
The combined concentration of all analytes listed in Table 3, Table 4, Table 5 and Table 6 (translated into an OC-normalized basis) proved minor in comparison to the organic carbon located in the DOM phase. As shown above, the OC of acetic Sulfo-NHS-LC-Biotin as the most abundant breakdown product accounted for about 1.5% of the OC in the pristine biomass, which translates into about 6.5% of the DOC (23% of the biomass’ OC is transferred into DOC, see Table 1). Thus, the overwhelming majority of the DOC was macromolecular in nature as immovable joint was found with other biomasses previously (Poerschmann et al., 2014).
Concentrations of N-functionalized breakdown products in HTC slurry (200 °C), data in μg g−1 DMBiomass.AnalyteMW (Da)CSlurryPyrrolidine71342-Pyrrolidone8563Pyrrol-2-aldehyde95553-Pyridinol951952,5-Pyrrolidinedione9914∑ (C2-pyrazines)10890Σ (M-pyridinols)109782-Acetylpyrrole10919Acetylpyridine12123∑ (C3-pyrazines)12251Σ (M-pyridinemethanols)12341Σ (C2-pyridinols)12333Σ (M-2-acetylpyrroles)123125-Oxo-proline carboxylate129220Σ (C2-pyridinemethanols)13730Full-size tableTable optionsView in workspaceDownload as CSV