Spectrophotometric Determination of Iron(II) after Solid Phase Extraction of Its 2,2′ Bipyridine Complex on Silica Gel-Polyethylene Glycol

Table 1

Effect of different eluents on the absorbance of eluted Fe(II)-2,2′ bipyridine complex.

Eluent	Absorbance
Acetone	0.05
DMSO	0.04
H2SO4 (1 mol L^−1)	0.06
HCl (1 mol L^−1)	0.03
HNO3 (1 mol L^−1)	0.04
Acetonitrile-H2SO4 (1 mol L^−1)	0.27
Acetone-H2SO4 (1 mol L^−1)	0.78
Acetonitril-HCl (1 mol L^−1)	0.18