Determination of cobalt,copper and nickel in food samples after pre-concentration on a new pyrocatechol-functionalized polyurethane foam sorbent |
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| Affiliation: | 1. Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 91701 Trnava, Slovakia;2. Department of Physical Chemistry, FCHPT, Slovak University of Technology, 81237 Bratislava, Slovakia;3. Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia;1. Department of Chemistry and Chemical Engineering, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, Ontario K7K 7B4, Canada;2. Department of Chemistry, University of Ottawa, 10 Maria Curie, Ottawa, Ontario K1N 6N5, Canada;1. School of Physics and Chemistry, Research Center for Advanced Computation, Xihua University, Chengdu 610039, China;2. Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, GA 30602, USA;1. University of Belgrade, Institute for Chemistry, Technology and Metallurgy, Belgrade, Serbia;2. University of Belgrade, Vinca Institute of Nuclear Sciences, P.O. Box 522, Belgrade, Serbia;3. University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia;1. School of Chemistry and Chemical Engineering, Huangshan University, Huangshan 245041, China;2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China |
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| Abstract: | Polyurethane foam functionalized with pyrocatechol by covalent coupling through –N C– group, is applied to an on-line pre-concentration system for cobalt, copper and nickel determination in food samples. The preparation of the packing material involved the reaction of 2,3-dihydroxybenzaldehyde with the amino groups of polyurethane foam. Metal ions were sorbed in the minicolumn, from which it could be eluted with acid solutions directly to the nebulizer-burner system of the flame atomic absorption spectrometer (FAAS). Under the optimum conditions, the enrichment factors obtained were 55, 42 and 54, for cobalt, copper and nickel, respectively, if used 180 s pre-concentration time. The detection limits of the proposed procedure were 0.5 (Co), 0.4 (Cu) and 0.6 (Ni) μg L−1. The method was applied to determination of the metals in spinach, rice flour, corn flour and black tea samples. The accuracy of the developed procedure was evaluated by analysis of the certified reference material NIST 1570a Spinach Leaves. |
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