Method

Na-sepiolite

Na-palygorskite

SiO2 [24]

Al2O3 [24]

Kaolinite [27]

log ka1int

Stumm

−6.0

−6.2

0.3

−7.2

−4.4

log ka2int

−10.5

−11.5

−7.2

−9.5

−9.2

½(pka1int + pka2int) [28] [29]

8.3

9.0

3.5

8.5

6.8

log ka1

DDLM

-4

−5

-

-

-

log ka2

−9.5

−9.5

-

-

-

log kXH

1.5

1.5

-

-

-

log kXNa

1

3

-

-

-

log kX2Mg

5

5

-

-

-