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Table 4 MPFD experimental design: 5 levels for 3 components. V = 25 mL of ammonia buffer solution at pH = 10 and 0.033 g of PAN-CC

From: Low-cost, disposable colourimetric sensors for metal ions detection

Variable levels Design of experiments
Level c (μM)   [Co] [Ni] [Zn]
− 2 0 1 0 0 0
− 1 3.5 2 0 − 2 − 1
0 4.5 3 − 2 − 1 − 2
1 5.5 4 − 1 − 2 2
2 7 5 − 2 2 2
   6 2 2 0
   7 2 0 − 1
   8 0 − 1 2
   9 − 1 2 − 1
   10 2 − 1 1
   11 − 1 1 1
   12 1 1 0
   13 1 0 2
   14 0 2 1
   15 2 1 2
   16 1 2 − 2
   17 2 − 2 − 2
   18 − 2 − 2 0
   19 − 2 0 1
   20 0 1 − 2
   21 1 − 2 1
   22 − 2 1 − 1
   23 1 − 1 − 1
   24 − 1 − 1 0
   25 − 1 0 − 2