Elutant

Desorption efficiency (%) of Ni2+

Desorption efficiency (%) of Cd2+

0.1 M HCl

97.8

98.7

0.1 M CaCl2

57.5

49.6

0.1 M Na2CO3

19.2

38.3

0.1 M EDTA

74.8

80.1

ddH2O

2.8

1.9