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Environmental Systems Research

Table 1 Factors and their levels for removal of fluoride using full factorial design

From: Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Factors

Code

Minimum level

Intermediate level

Maximum level

Dosage (g/100 mL)

X1

0.5

1

1.5

pH

X2

2

7

9

Contact time (min.)

X3

60

90

120

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