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Table 2

Factor levels and symbols

FactorSymbolLevel
Low (-1)Central (0)High (+1)
Cathode plate structure (/) TP 3 × 6TM 4.5 × 6TM 
Power supply duty ratio (%) 20 50 80 
Solution residence time (min) 10 20 30 
FactorSymbolLevel
Low (-1)Central (0)High (+1)
Cathode plate structure (/) TP 3 × 6TM 4.5 × 6TM 
Power supply duty ratio (%) 20 50 80 
Solution residence time (min) 10 20 30 
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