Total metal bound (meq·g⁻¹)

Amount of cation released (meq·g⁻¹)

Zn²⁺

Cd²⁺

Ni²⁺

Al³⁺

Na⁺

K⁺

Ca²⁺

Mg²⁺

Rb/r

a 0.0153

0.0589

0.0158

0.0050

0.0103

0.0675

0.0359

0.0277

0.671

b 0.0354

0.0972

0.0337

0.0050

0.0217

0.1838

0.1165

0.532