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Effect of sample volume on the microextraction efficiency. Extraction conditions: extraction solvent, chloroform (40 µl); disperser solvent, acetone (1 ml); analyte concentration, 7 µg/ml of sodium valproate; pH, 2.0; concentration of NaCl, 4% (w/v); extraction time, ~0 min; centrifugation time, 5 min and centrifugation speed, 6000 rpm. The bars indicate the standard deviations (n=3)
