Characterization of biochars produced from peanut hulls and pine wood with different pyrolysis conditions

Bioresources and Bioprocessing

Table 2 Elemental and proximate analysis of biochars was carried out by Galbraith Laboratories, Knoxville, TN

Sample ID	% Loss on drying	% Volatile matter @950 °C	% Ash	% Fixed carbon (by difference)	C % (mol %)	H % (mol %)	% N (mol %)	O % (mol %)	S % (mol %)	O:C (mol ratio)
#4	5.86	23.13	7.57	65.54	71.54 (0.060)	2.90 (0.03)	2.08	16.59 (0.010)	0.106	0.167:1
#5	6.30	22.25	7.51	67.08	72.33 (0.060)	2.80 (0.028)	1.92	15.00 (0.0094)	0.108	0.156:1
#6	13.31	25.78	7.16	60.41	68.26 (0.057)	2.76 (0.028)	1.97	19.88 (0.012)	660 ppm	0.218:1
#8	4.54	22.60	7.54	67.60	74.78 (0.062)	3.19	<0.5	14.99 (0.0094)	<0.09	0.151:1
#9	5.37	22.55	4.50	70.27	76.59 (0.0638)	2.97	<0.5	15.42 (0.0096)	<0.08	0.151:1
#12	8.14	6.15	14.66	75.12	74.94 (0.062)	0.84 (0.084)	0.95	7.45 (0.0047)	0.16	0.075:1
#13	19.58	8.86	13.60	67.76	72.68 (0.061)	0.71 (0.071)	0.53	12.61 (0.0079)	0.17	0.129:1

Analysis results are the average of two analyses per sample expressed as % dry weight, except for the percent loss on drying, which is based on a one-time analysis. Standard deviations were <10 % (values given in parentheses)