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Table 2 Screening of critical factors for A. niveus

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

Chromium

Tannic acid

Variable

Stdized effect

% contribution

Coefficient estimate

P value

Stdized effect

% contribution

Coefficient estimate

P value

pH

6.06

4.53

3.03

0.0089

7.47

2.23

3.73

0.4348

Temperature

2.88

1.02

1.44

0.0187

8.32

2.77

4.16

0.4016

Incubation period

1.12

0.16

0.56

0.0479

− 17.63

12.45

− 8.81

0.2112

Agitation speed

− 6.14

4.66

− 3.07

0.0088

− 6.20

1.54

− 3.10

0.4935

Inoculum size

1.49

0.27

0.74

0.0361

8.28

2.75

4.14

0.4028

Cr concentration

12.49

19.27

6.25

0.0043

28.58

32.70

14.29

0.0333

TA concentration

8.85

9.68

4.43

0.0061

30.98

38.44

15.49

0.0232

Glucose

16.96

35.51

8.48

0.0032

8.87

13.15

4.44

0.0421

NH4Cl

12.79

20.19

6.39

0.0042

1.82

0.13

0.91

0.0151

MgSO4

3.89

1.87

1.95

0.0138

3.37

0.46

1.69

0.6774

K2HPO4

4.80

2.84

2.40

0.0112

6.91

1.91

3.45

0.4593