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Table 1 Values of pKa,1 and pKa,2

From: New possibility for characterization of dissociation behaviour of supramolecular electrolytes: results obtained for the International Humic Substances Society standard and reference samples by coulometry

Sample

pKa,1

pKa,2

NLHA

6.18 ± 0.07

3.35 ± 0.08

ESHA

6.46 ± 0.04

3.48 ± 0.09

SRHA

6.32 ± 0.12

3.78 ± 0.15

PPHA

6.52 ± 0.06

3.41 ± 0.07

LEHA

7.13 ± 0.10

3.89 ± 0.05

NLFA

9.98 ± 0.12

3.82 ± 0.10

ESFA

9.86 ± 0.08

3.03 ± 0.08

SRFA

9.21 ± 0.07

3.08 ± 0.04

PPFA

8.92 ± 0.05

3.05 ± 0.02