The optimization step was carried out using factorial design and the variables studied were pH, shaking time and reagent concentration.
The optimization step was performed by a two-level fractional factorial design involving the variables: pH, dithizone mass, shaking time after addition of dithizone and shaking time after addition of solvent.
Four variables including pH, shaking time, mass of polymer and morin were selected as the factors affecting the optimization process.
The influence of shaking time, medium pH, the concentration of sorbent and NaNO3 on removal was evaluated to greatly influence removal extent.
A Plackett Burman design was used to screen multiple method factors including extraction solvent strength, extraction solvent volume, shaking speed of a reciprocating shaker, and shaking time.
The Multisimplex program suggested as optimal conditions an average of 6 ml of organic solvent and 23 min of shaking time.
The optimum conditions were determined to be initial dye concentration 11.82 mg.L− 1, adsorbent amount 0.0248 g, shaking time of 36 min and pH 2.
The important variable such as initial pH solution, SBA-15-BSEA-Fe3O4-NPs SBA-15-BSEA-Fe3O4-NPs SBA-15-BSEA-Fe3O4-NPs SBA-15-BSEA-Fe3O4-NPs SBA-15-BSEA-Fe3O4-NPs.
The effect of pH, temperature, initial strontium concentration and shaking time on strontium sorption were investigated via experimental design method using central composite design (CCD).
The optimal conditions for UAE were found, namely ultrasound digestion time of 40 min (at 35 °C), shaking time of 4 min, and the three subsequent extractions.
pH, temperature, strontium concentration and shaking time were chosen as independent variables and the efficiency of strontium removal as dependent output variable.
