beta-cyclodextrin-cross-linked polymer as solid phase extraction material coupled graphite furnace atomic absorption spectrometry for separation/analysis of trace copper

摘要

The beta-cyclodextrin cross-linked polymer (beta-CDCP) was synthesized by the reaction of beta-cyclodextrin with epichlorohydrin in NaOH and characterized by fourier transform infrared spectroscopy and thermoanalysis. The beta-CDCP as a solid phase extraction (SPE) material was used to preconcentrate/separate trace copper using 1-(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 mu g.L-1 with RSD 4.27% (n = 5, c = 25.0 mu g L-1). The linear range is 6.25-31.25 mu g L-1. Moreover, the beta-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.