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Table 3 Critical EO unit numbers for alkali-metal ions[12, 14]

From: Basic surface-active properties in the homologous series of β-alkyl (C12H25/C18H37) polyethyleneoxy (n = 0-20) propionamides

Alkali cation

Double adduct

Triple adduct

Li+

12

24

Na+

12

24

K+

15

28

Rb+

17

31

Ca2+

19

34