Research Article
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 | PFa | 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 |
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aPreconcentration factor.
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