Table 1 Coded and actual levels of the independent parameters in CCD (α = axial points).

From: Ce(ΙΙΙ) and La(ΙΙΙ) ions adsorption through Amberlite XAD-7 resin impregnated via CYANEX-272 extractant

Variable

Symbols

Levels

− α = − 2

− 1

0

+ 1

+ α = + 2

pH

A

2

3

4

5

6

Temperature (°C)

B

15

25

35

45

55

SIR dose (gr)

C

0.05

0.2

0.35

0.5

0.65

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