Even if there is not an unique
definition of the pyrolysis processes (Mohan et al., 2006), B1 is here
defined as biochar produced by a slow pyrolysis process and B2 as
biochar produced by fast pyrolysis process. Total organic carbon (C)
and total N biochar contents were determined using a CHN
Elemental Analyzer (Carlo Erba Instruments, mod 1500, series 2),
after complete removal of inorganic C with acid