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Effect of the sample volume on the analytical signal of thymol (5.0 mg L−1) and carvacrol (5.0 mg L−1). Experimental conditions: extractant solvent (1-undecanol) = 20.0 µL; disperser solvent (acetone) = 0.50 mL; pH 7.0; %NaCl = 7.0%; ultrasound duration time = 10.0 min; and centrifuging duration time (at 800 rpm) = 7.5 min (n = 3).
