Table 1.

Characterization of waste glycerol fraction (Bioagra-Oil S.A., Tychy)

Parameter	Unit	Average value ± SD
Glycerol	g/100 g	60.29 ± 0.38
Methanol	g/100 g	3.30 ± 0.10
Sodium	g/100 mL	1.107 ± 0.083
Calcium	g/100 mL	0.024 ± 0.003
Potassium	g/100 mL	0.007 ± 0.000
Phosphorus	g/100 mL	0.004 ± 0.001
Magnesium	g/100 mL	0.003 ± 0.001
pH	− log (H+)	12.1 ± 0.1