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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