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
110
60
140
0.141
120
130
0.143
95
0.105
170
80
0.100
66
200
160
40
0.080
53