β-Cyclodextrin-Cross-Linked Polymer as Solid Phase Extraction Material Coupled Graphite Furnace Atomic Absorption Spectrometry for Separation/Analysis of Trace Copper

Abstract

The β-cyclodextrin cross-linked polymer (β-CDCP) was synthesized by the reaction of β-cyclodextrin with epichlorohydrin in NaOH and characterized by fourier transform infrared spectroscopy and thermoanalysis. The β-CDCP as a solid phase extraction (SPE) material was used to preconcentrate/separate trace copper using l-(2-pyridylazo)-2-naphthol (PAN) as a complexing agent for Cu-(II)-PAN coupled with a graphite furnace atomic absorption spectrometry (GFAAS) for analysis. The optimized experiment conditions and adsorption capacity were investigated. The detection limit (DL) was 1.11 µg.L⁻¹ with RSD 4.27% (n = 5, c = 25.0 µg L⁻¹). The linear range is 6.25–31.25 µg L⁻¹. Moreover, the β-CDCP could be used repeatedly and offered better a recovery and estimation of trace copper. In order to verify the accuracy of the method, a certified reference water sample was analyzed and the results obtained were in agreement with the certified values. The recovery for copper was 103.6%. The proposed method was applied to the analysis of copper in lake water samples.

Keywords:

• Copper
• β-cyclodextrin cross-linked polymer
• graphite furnace atomic absorption spectrometry
• solid phase extraction

This work was supported by the Cultivation and Construction Fund of the State Key Subject of Physical Chemistry.

Notes

*National reference materials (China)

^a:Surface lake water was collected from Slender West Lake, Yangzhou, China