Table 3.

Ultimate analysis (ash-free basis) of untreated and pretreated biomass.

	Nitrogen (%)	Carbon (%)	Hydrogen (%)	Oxygen (%)	Ash (%)
Raw hardwood	0.14	46.42	5.43	48.01	0.67
Hardwood 1 h	0.06	45.62	5.49	48.83	0.38
Hardwood 3 h	0.04	45.49	5.74	48.73	0.32
Hardwood 5 h	0.04	44.72	5.70	49.54	0.29
Raw softwood	0.08	51.68	5.76	42.48	0.36
Softwood 1 h	0.05	46.60	5.71	47.64	0.30
Softwood 3 h	0.04	45.69	5.71	48.56	0.30
Softwood 5 h	0.03	45.35	5.52	49.10	0.29