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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)