For obtaining optimized volume of acetonitrile, various experiments were used by using different volumes of acetonitrile (100, 200, 300, 400 and 500 l) containing different volumes of 1-undecanol and all experiments were performed in triplicates. Variation of the volume of acetonitrile causes changes in the volume of the floated phase; hence, it is impossible to consider the influence of acetonitrile volume on the extraction efficiency. In or der to avoid this and also to achieve a constant volume of the floated phase, the volume of acetonitrile and 1-undecanol were
changed simultaneously. According to the results in Fig. 3, with low volumes of the disperser solvent the cloudy state is not formed satisfactorily and thereby DLLME-SFO procedure is disturbed. On the other hand, with large volumes of the disperser, the solubility of analytes in aqueous phase increases and hence the extraction efficiency decreases.
Thus, 300 of acetonitrile was selected as the volume of disperser solvent in subsequent experiments
For obtaining optimized volume of acetonitrile, various experiments were used by using different volumes of acetonitrile (100, 200, 300, 400 and 500 l) containing different volumes of 1-undecanol and all experiments were performed in triplicates. Variation of the volume of acetonitrile causes changes in the volume of the floated phase; hence, it is impossible to consider the influence of acetonitrile volume on the extraction efficiency. In or der to avoid this and also to achieve a constant volume of the floated phase, the volume of acetonitrile and 1-undecanol werechanged simultaneously. According to the results in Fig. 3, with low volumes of the disperser solvent the cloudy state is not formed satisfactorily and thereby DLLME-SFO procedure is disturbed. On the other hand, with large volumes of the disperser, the solubility of analytes in aqueous phase increases and hence the extraction efficiency decreases. Thus, 300 of acetonitrile was selected as the volume of disperser solvent in subsequent experiments
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