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Table 1 Experimental ranges and levels of independent parameters according to RSM design

From: Optimization of diazinon biodegradation from aqueous solutions by Saccharomyces cerevisiae using response surface methodology

Parameters Symbol Levels
−α −1 0 +1
Concentrations of diazinon (mg/L) A 0.01 2.5 5 7.5 10
Reaction time (h) B 1 8.25 15.5 22.75 30
Concentration of S. cerevisiae (%) C 0.5 1.63 2.75 3.88 5
pH D 4 5.5 7 8.5 10