Ultimate analysis
The total C contents range from 9.3–54 wt.% (Table 2), with the
majority of the samples showing contents greater than 30 wt.%. The H
and N contents range from 1.2–4 wt.% and up to 1.7 wt.%, respectively.
Sulphur contents range from 0.5–7.2 wt.%. The lowest C, H, N
concentrations were reported for the sample KP4, due to the low
organic matter content. Maximum C and H concentrations were
measured in sample TH7, whereas samples TH3 and MT6 showed the