Abstract
In this paper, a new solid phase extraction procedure is described for Cu(II),
Co(II), and Ni(II). Silica gel which was coated with N,N’-bis(4-methoxysalicylidene)
ethylenediamine (MSE) is used as a sorbent. Three independent variables were optimized
using central composite design (CCD) for sorption and elution of metal ions. The optimum
values of sorption and elution variables allowed simultaneous preconcentration of the
ions in same conditions as follows, for sorption, pH 6.9, flow rate
5.4 mL min–1, sample volume 50.0 mL, and for elution, flow rate
2.6 mL min–1, eluent concentration 1.0 mol L–1, eluent volume
5.0 mL. The detection limits (LOD) were found to be 1.1 µg L–1 for Cu(II),
7.4 µg L–1 for Co(II), and 7.5 µg L–1 for Ni(II) and
preconcentration factor was 200 for each of the ions. The accuracy of the method was
tested with Lake Ontario water and multi-element standard solution. The proposed method
was also applied to various water samples. The proposed method can be alternatively
suggested as accurate, precise, easy, and a cheap method for Cu(II), Co(II), and Ni(II)
determination.
© 2016 The Author(s)
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