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Table 1 Experimental range and levels of independent factors in the Plackett–Burman design

From: Optimization and enhancement of textile reactive Remazol black B decolorization and detoxification by environmentally isolated pH tolerant Pseudomonas aeruginosa KY284155

Factor Unit Symbol Levels
Low − 1 Center 0 High + 1
Glucose g L−1 C 0 1 5
Yeast extract g L−1 N 0 4 8
NaCl g L−1 Salt 0.1 0 2
Sodium nitrate g L−1 NO3 0.1 0 2
Ferrous sulfate
FeSO4·7H2O
g L−1 Fe 0 0.01 0.5
Magnesium sulfate
MgSO4·7H2O
g L−1 Mg 0 0.5 1
Initial pH pH pH 5 7 8
Temperature °C Temp 25 30 37
Dye concentration mg L−1 Conc 25 50 250
EDTA mM EDTA 0.1 0 2
Sodium acetate g L−1 Acetate 0.1 0 1