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To obtain optimized volume of THF,
various experiments were performed by using different
volumes of THF (0.5, 1.0, 1.5, and 2.0 mL) containing 21.0,
22.0, 25.0, and 30.0 lL C2H2Cl4, respectively. It is necessary
to change the volume of C2H2Cl4 by changing the voliume of THF in order to obtain a constant volume of sedimented  phase (20.0 l 1.0 lL) in all experiments


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