Investigated Parameters

Levels

Extractant mass fraction (%)

2.0, 3.0, 5.0, 7.0

Surfactant mass fraction (%)

0.5, 1.0, 3.0, 5.0

Modifier mass fraction (%)

0, 3.0, 5.0, 7.0

Fixed Parameters

Levels

Stirring speed (min−1)

13,000

Stirring time (min)

5

pH of the inner phase

9.5

KClIP concentration (mol・L−1)

2.0

Volume ratio (MP/IP)

3:1

Temperature (˚C)

25