Beta-cyclodextrin-cross-linked polymer as solid phase extraction material coupled with inductively coupled plasma mass spectrometry for the analysis of trace Co(II).

A sensitive method for the separation/analysis of Co(II) was described. The beta-cyclodextrin cross-linked polymer (beta-CDCP) was synthesized and used as solid phase extraction material (SPE) to separate/pre-concentrate trace cobalt coupled with inductively coupled plasma mass spectrometry (ICP-MS) for the analysis of Co(II). The method was based on alpha-pyridylazo-beta-naphthol (PAN) as the complexing agent for Co(II)-PAN at neutral condition and the adsorption behavior of Co(II)-PAN on beta-CDCP was studied. Further, p-octylpolyethylene-glycolphenyl ether (Triton X-100) as environment-friendly eluant was used. The linear range, detection limit (DL) and the relative standard deviation (R.S.D.) was 5.0-160.0 ng/mL, 5.84 ng/L and 2.27% (n=3, c=30.0 ng/mL) respectively. The enhancement factor was 10. Moreover, the beta-CDCP could be used repeatedly and offered better recovery and estimation of standard samples.