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Table 2 Results of investigation of the effect of the ratio of volume of the sedimented phase to volume of ethanol (diluting solvent) on the analytical signal of Cu(II) determined by DLLME

From: Determination of copper(II) by flame atomic absorption spectrometry after its perconcentration by a highly selective and environmentally friendly dispersive liquid–liquid microextraction technique

Volume of sedimented phase (μL) Added volume of chloroform (μL) Added volume of ethanol (μL) A Cu
50 0.0 150 0.106
50 20 130 0.104
50 40 110 0.107
50 60 90 0.105
50 80 70 0.104
  1. Conditions: sample volume, 10.0 mL; Cu(II), 50.0 μg L−1; solution pH = 2.0; salophen, 2.0 × 10−5 M; disperser solvent (acetone) volume, 1.30 mL; diluting solvent, ethanol; centrifuge time, 5 min (at 5000 rpm)