Abbreviation	Meaning
A	Ash content (%)
AC	Activated carbon
AEC	Anion exchange capacity (cmol(+)/kg)
BC	Biochar
BET	Brunauer–Emmett–Teller
BJH	Barrett–Joyner–Halenda
C	BET isotherm constant (-)
CEC	Cation exchange capacity (cmol(+)/kg)
d	Average pore size (Å)
EDS	Energy-dispersive X-ray spectroscopy
EDTA	Ethylenediaminetetraacetic acid
FC	Fixed carbon (%)
G	Conductivity (S or Ω−1)
g	Constant of acceleration of gravity (9.81 m/s2)
IV	Iodine index (g/kg)
LOD	Limit of detection
m1	Mass of the sample (g)
m2	Mass of the sample at ≈105 °C (g)
m3	Mass of the sample at ≈600 °C (g)
m4	Residual mass of the sample after combustion (g)
M	Moisture content (%)
MB	Methylene blue dye
MBI	Methylene blue index (g/kg)
N	Avogadro’s number = 6.022 × 1023 (molecules/mol)
p/p0	Relative pressure (-)
pH	Potential of hydrogen (-)
pHPZC	Point of zero charge (-)
PSD	Particle size distribution (%)
r	True pore radius
rK	Kelvin pore radius
R	Universal gas constant = 8.314 (J/(mol °K))
s	Cross-sectional area of adsorbed gas molecule (m2)
SBET	Specific surface area (m2/g)
SEM	Scanning electron microscopy
t	Adsorbed layer thickness on the pore wall
T	Temperature (°C or °K)
TGA	Thermogravimetric analysis
v	Multilayer adsorbed gas volume (cm3)
vm	Monolayer absorbed gas volume (cm3)
V	Molar volume of adsorbed gas
VL	Molar volume of the liquid (cm3/mol)
VT	Pore volume (cm3/g)
VM	Volatile matter (%)
VOCs	Volatile organic compounds
XRD	X-ray diffraction analysis
XRF	X-ray fluorescence analysis
γ	Estimated specific weight (N/m3)
γL	Surface tension of the liquid (N/m)
θ	Contact angle (°)
ρ	Estimated density (kg/m3)
ρb	Apparent or bulk density (kg/m3)
λ0	Wavelength (nm)
τ	Thickness of the single adsorption layer (nm)