Rapid Quantitative Analysis of Forest Biomass Using Fourier Transform Infrared Spectroscopy and Partial Least Squares Regression

Table 2

Performance evaluation of PLS models developed using 1st-derivative treated spectra of the full (i) and fingerprint (ii) regions for predicting thermal reactivity and energy content.

Constituent	Ash (%)	Fixed carbon (%)	Volatile matter (%)	HHV (MJ/kg)
LVs
(i)	3	2	2	2
(ii)	3	2	2	2
SEC
(i)	0.49	1.26	1.07	0.34
(ii)	0.6	1.35	1.03	0.38
SECV
(i)	1.07	1.6	1.31	0.53
(ii)	1.09	1.54	1.15	0.44
(i)	0.8	0.85	0.87	0.64
(ii)	0.7	0.83	0.88	0.54
RPD
(i)	0.98	1.96	2.17	1.03
(ii)	0.96	2.04	2.31	1.23