4. APPLICATION
A New Spectrophotometric Determination to
Fe(III) Ions in Natural Water
The UV-vis spectrum of the Fe(III) solution in the presence of the Schiff base ligand was measured from 250 to 900 nm at an interval of 1 nm and an average measuring time of 1 s per wavelength and the maximum wavelength is found at 313 nm. Several factors influence on the
recovery method are studied for [Fe(III)-L] system in order
to achieve maximum recovery. The optimum factors are
pH = 3, 25˚C, 1:1 (M:L) metal to ligand ratio and 30 min. In order to assess the applicability of the proposed method to recover Fe(III) from spiked water samples, the effect
of some foreign ions was also investigated. These foreign
ions were selected on the basis that they are normally present in natural water samples. Solutions containing
various amounts of foreign ions, Fe(III), and the ligand
were subjected to the described spectrophotometric procedure. The tolerable amounts of each ion, given a maximum error up to 1.23% in the recovery, are summarized
in Table 7. As can be seen, all the investigated foreign
ions with a relatively high concentration have no adverse
effect on the ferric ions determinate.