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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)