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http://dx.doi.org/10.5806/AST.2015.28.4.255

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

Baek, Hyeon Jung (Department of Chemistry, The University of Suwon)
Choi, Hee-Seon (Department of Chemistry, The University of Suwon)
Publication Information
Analytical Science and Technology / v.28, no.4, 2015 , pp. 255-259 More about this Journal
Abstract
A technique on the determination of Co(II) in aqueous samples with quinalizarin-β-cyclodextrin inclusion complex was developed. The conditions such as pH of the sample solution, the concentration of quinalizarin 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 concentration range 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 proposed technique, 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 on experimental results, it is proposed that this technique can be applied to the practical determination of Co(II).
Keywords
Co(II) determination; quinalizarin; β -cyclodextrin; spectrofluorimetry;
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