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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