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Table 1 Levels or variables chosen for the trials

From: Application of response surface methodology for optimization of metal–organic framework based pipette-tip solid phase extraction of organic dyes from seawater and their determination with HPLC

 

A

B

C

D

MG

2 (− 1)

200 (− 1)

7 (− 1)

7 (− 1)

3 (0)

250 (0)

9 (0)

9 (0)

4 (+ 1)

300 (+ 1)

11 (+ 1)

11 (+ 1)

MO

6 (− 1)

250 (− 1)

3 (− 1)

3 (− 1)

7 (0)

300 (0)

5 (0)

5 (0)

8 (+ 1)

350 (+ 1)

7 (+ 1)

7 (+ 1)

RB

2 (− 1)

250 (− 1)

5 (− 1)

5 (− 1)

3 (0)

300 (0)

7 (0)

7 (0)

4 (+ 1)

350 (+ 1)

9 (+ 1)

9 (+ 1)

AR

5 (− 1)

300 (− 1)

3 (− 1)

3 (− 1)

6 (0)

250 (0)

5 (0)

5 (0)

7 (+ 1)

350 (+ 1)

7 (+ 1)

7 (+ 1)