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Table 1 Plackett Burman experimental design matrix of eleven variables

From: Optimization of chromium and tannic acid bioremediation by Aspergillus niveus using Plackett–Burman design and response surface methodology

Run X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 % Cr removal % residual TA
1 5 30 96 110 3 100 2.75 0.5 1 0.5 0.5 90.75 54.06
2 7 20 144 180 1 150 5 0.8 0.5 0.2 0.2 74.83 74.73
3 3 40 144 40 5 150 5 0.2 0.5 0.2 0.8 91.44 92.03
4 3 40 144 180 1 50 0.5 0.8 0.5 0.8 0.8 59.32 12.49
5 3 20 48 180 1 150 5 0.2 1.5 0.8 0.8 88.71 92.05
6 7 40 48 40 1 150 0.5 0.8 1.5 0.2 0.8 99.57 70.8
7 7 20 144 180 5 50 0.5 0.2 1.5 0.2 0.8 97.63 27.24
8 7 40 144 40 1 50 5 0.2 1.5 0.8 0.2 97.21 74.73
9 3 40 48 180 5 50 5 0.8 1.5 0.2 0.2 72.31 74.73
10 3 20 144 40 5 150 0.5 0.8 1.5 0.8 0.2 94.15 55.95
11 3 20 48 40 1 50 0.5 0.2 0.5 0.2 0.2 87.11 40.41
12 7 20 48 40 5 50 5 0.8 0.5 0.8 0.8 60.16 74.73
13 7 40 48 180 5 150 0.5 0.2 0.5 0.8 0.2 99.99 90.22