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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