Stopped-flow injection determination of copper(II) at the ng ml−1 level |
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| Authors: | F Lázaro MD Luque de Castro M Valcárcel |
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| Institution: | Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba Spain |
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| Abstract: | A stopped-flow injection method for the determination of copper(II) in the range 0.2–300 ng ml?1 is proposed, based on the catalytic effect of this ion on the 2,2'-dipyridylketone hydrazone/hydrogen peroxide reaction. The oxidation product shows an intense blue fluorescence that is monitored at λex = 350 nm, λem = 427 nm. The sampling rate (72 h?1), r.s.d. (1.4%) and the lack of interference from most foreign ions, allowed application of the method to the determination of copper in foods and blood serum. |
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