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

Table 4

Comparison of the proposed method with some of the methods reported in literature.

System	PF^a	DL; (ng mL^−1)	Breakthrough; volume (mL)	Ref.
Amberite XAD-2000	50	0.32	250	[1]
Modified activated carbon	10	0.38	100	[2]
Flotation method	93	0.70	750	[3]
BHAPN/SDS-alumina	63	2.60	500	[21]
Naphthalene loaded with tetraoctylammonium bromide	36	12.00	180	[16]
Silica-PEG	250	0.57	500	This work

^aPreconcentration factor.