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Table 1 Effect of extraction solvent (chloroform) volume on the analytical signal and extraction efficiency of copper obtained from 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

Chloroform (μL) Sedimented phase (μL) Ethanol as diluting solvent (μL) A Cu Extraction Efficiency (%)
70 20 180 0.142 94
100 50 150 0.142 94
110 60 140 0.141 94
120 70 130 0.143 95
150 100 100 0.105 70
170 120 80 0.100 66
200 160 40 0.080 53
  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)