Abstract
A simple and selective method was established for the spectrophotometric determination of iron(II) in sea water after preconcentration by sorption of its 3-(2-pyridyl)-5,6-bis(4-phenylsulphonic acid)-1,2,4-triazine (ferrozine) complex with poly(chlorotrifluoroethylene) resin (PCTFE). The iron(II)-ferrozine complex was quantitatively retained as an ion-associate complex with tetrabutylammonium cation on PCTFE resin in the pH range 4.8–7.0. The retention capacity of the resin was 29 μg Fe(II) g −1 at a maximum flow-rate of 25 cm 3 min −1. Iron(II) retained on the resin column was completely eluted with 5 cm 3 of methanol and the eluate was directly submitted to spectrophotometric measurement at 562 nm. The recovery and detection limit of iron(II) from sea water were 97 ±2% and 88 ng dm −3 (1.6 nmol dm −3), respectively.
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