Chemically Modified Polystyrene with a Synthesized N3O2 Schiff Base as a New Solid Phase Sorbent for on Line Preconcentration and Determination of Copper(II) in Water Samples by FAAS
Keywords:
Atomic absorption spectrometry; On-line preconcentration; Polystyrene; Schiff base; Copper(II)Abstract
This paper reports the synthesis and application of a new sorbent for on-line preconcentration of
copper prior to its determination with atomic absorption spectrometry (AAS). The sorbent was
prepared by immobilization of N,N-bis(naphthylideneimino)diethylenetriamine on chloromethylated
polystyrene. Copper was sorbed on a mini-column packed with sorbent and subsequent eluted
quantitatively by HCl and determined by flame atomic absorption spectrometry (FAAS). All variables
were optimized for the quantitative preconcentration of copper ions and a study of interference level of
various ions was also carried out. Under the optimum conditions, linear calibration graphs over the
concentration ranges of 2.0-44.0 and 0.70-30.0 μg L-1
; detection limits of 1.4 and 0.46 μg L-1
; and
enrichment factors of 80 and 183 were obtained for the preconcentration volumes of 10.0 and 25.0 mL
of copper(II) solutions, respectively. Good relative standard deviations of 4.1 and 3.5% for ten
replicate determinations of 10.0 and 30.0 µg L
−1
of copper were obtained, respectively.