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Effect of the type of buffer solution on the analytical signal in the determination 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%; sample volume = 5.0 mL; ultrasound duration time = 10.0 min; and centrifuging duration time (at 800 rpm) = 7.5 min.
