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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