Carbon

Functional group (méq∙g−1)

pHZPC

Acid

Base

carboxylic

Lacton

Phenol

Total

Total

CAA

0.75

0.40

0.70

1.85

0.18

4.8

CAB

0.00

0.35

0.00

0.35

1.18

8.4

CAS

0.00

0.00

0.80

0.80

0.69

6.8