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Table 1 The levels of variables used in the optimization process

From: Response surface optimization of a vortex-assisted dispersive liquid–liquid microextraction method for highly sensitive determination of repaglinide in environmental water by HPLC/UV

Variable Range
Type of extractant 1-octanol, 1-decanol, 1-undecanol, 1-dodecanol
Volume of extractant 30–150 µL
Type of disperser methanol, acetonitrile, glycerol, propylene glycol
Volume of disperser 100–500 µL
Sample pH 2 –8