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Table 4

Levels and range of independent variables

Coded variablesLevels and ranges
Lowest (−α)Low (−1)Center (0)High (+1)Highest (+α)
Salt (g) −1.25 3.25 5.5 7.75 
Extraction time (min) −7.5 17.5 30 42.5 
Extraction temp (°C) 30 55 80 105 
Desorption time (min) −4 14 20 
Coded variablesLevels and ranges
Lowest (−α)Low (−1)Center (0)High (+1)Highest (+α)
Salt (g) −1.25 3.25 5.5 7.75 
Extraction time (min) −7.5 17.5 30 42.5 
Extraction temp (°C) 30 55 80 105 
Desorption time (min) −4 14 20 
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