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Bioresources and Bioprocessing

Table 2 Results of treated and untreated biochar samples for elemental analysis measured by percentages of C, H, N, and balance (the remainder elements including O and the ash component)

From: Surface oxygenation of biochar through ozonization for dramatically enhancing cation exchange capacity

Sample

% C

% H

% N

% balance

Untreated

73.90 ± 0.06

3.32 ± 0.06

< 0.5

22.78

30 min O3

66.76 ± 2.77

3.17 ± 0.45

< 0.5

30.07

60 min O3

71.70 ± 0.27

3.35 ± 0.07

< 0.5

24.95

90 min O3

71.31 ± 0.30

3.34 ± 0.04

< 0.5

25.35

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