Table 2 Design matrix and response values (area counts) for Plackett-Burman factorial design
Sample amount (g) | Extractant volume (mL) | Boiling time (h) | Rinsing time (h) | Alumina amount (g) | Acid silica amount (g) | Elution volume (mL) | Area counts | |
|---|---|---|---|---|---|---|---|---|
EXP 1 | 2 | 30 | 2.0 | 1.00 | 8 | 4 | 130 | 7,571,262 |
EXP 2 | 4 | 50 | 1.0 | 1.00 | 8 | 4 | 130 | 10,786,966 |
EXP 3 | 4 | 30 | 1.0 | 0.50 | 8 | 8 | 130 | 5,778,221 |
EXP 4 | 2 | 30 | 1.0 | 1.00 | 8 | 8 | 80 | 3,682,164 |
EXP 5 | 2 | 50 | 1.0 | 0.50 | 4 | 8 | 130 | 3,326,814 |
EXP 6 | 4 | 50 | 1.0 | 1.00 | 4 | 4 | 80 | 12,009,019 |
EXP 7 | 2 | 30 | 1.0 | 0.50 | 4 | 4 | 80 | 4,926,262 |
EXP 8 | 3 | 40 | 1.5 | 0.75 | 6 | 6 | 105 | 1,259,106 |
EXP 9 | 4 | 30 | 2.0 | 1.00 | 4 | 8 | 80 | 8,364,945 |
EXP 10 | 2 | 50 | 2.0 | 1.00 | 4 | 8 | 130 | 7,771,676 |
EXP 11 | 4 | 30 | 2.0 | 0.50 | 4 | 4 | 130 | 6,350,117 |
EXP 12 | 4 | 50 | 2.0 | 0.50 | 8 | 8 | 80 | 8,841,669 |
EXP 13 | 2 | 50 | 2.0 | 0.50 | 8 | 4 | 80 | 6,700,095 |
EXP 14 | 3 | 40 | 1.5 | 0.75 | 6 | 6 | 105 | 1,816,600 |