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A technique on the determination of Co(II) in aqueous samples with quinalizarin-β-cyclodextrininclusion complex was developed. The conditions such as pH of the sample solution, the concentration ofquinalizarin and the concentration of β-CD were optimized to 11.3(±0.2), 1.2×10 −6 M and 8.0×10 −6 M,respectively. Under these optimum conditions, the calibration curve of Co(II) was obtained over concentrationrange of 5.0×10 −9 ~ 1.2×10 −7 M. The detection limit was 4.2×10 −9 M (0.25 ng/mL). For validating this proposedtechnique, aqueous samples(stream water, reservoir water and tap water) were used. Recovery yields of 95~105%were obtained. The relative standard deviation(%) in aqueous samples were less than 7.0%. Based onexperimental results, it is proposed that this technique can be applied to the practical determination of Co(II).Key words: Co(II) determination, quinalizarin, β-cyclodextrin, spectrofluorimetry 1.                     .  3 , , ,

Spectrofluorimetric determination of trace Co(II) in aqueous samples with quinalizarin-β-cyclodextrin inclusion complex