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Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52078#.VIpn-cnQrzE Author(s) Nikolay L. Lavrik , Nurullo U. Mulloev Affiliation(s) Siberian Branch of the Russian Academy of Sciences, Voevodsky Institute of Chemical Kinetics and Combustion, Novosibirsk, Russia . ABSTRACT In conditions of monochromatic excitation ( λ exc =337.1), the spectral dependence of the efficiency of fluorescence quenching α λ of humic acids samples by Cd 2+ and Cu 2+ ions was studied. The difference of α λ dependencies for these ions was established. In the spectral range 350 - 650 nm, changes of the α λ for Cd 2+ ion are markedly different from the magnitude for changes α λ , which occur for ion Cu 2+ . The interpretation of mismatch dependences obtained α λ ions Cd 2+ and Cu 2+ is carried out within the concept of the availability of different sites, due to the difference in ionic radii (0.108 ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52078#.VIpn-cnQrzE Author(s)   Nikolay L. Lavrik, Nurullo U. Mulloev Affiliation(s) Siberian Branch of the Russian Academy of Sciences, Voevodsky Institute of Chemical Kinetics and Combustion, Novosibirsk, Russia . ABSTRACT In conditions of monochromatic excitation ( λ exc =337.1), the spectral dependence of the efficiency of fluorescence quenching α λ of humic acids samples by Cd 2+ and Cu 2+ ions was studied. The difference of α λ dependencies for these ions was established. In the spectral range 350 - 650 nm, changes of the α λ for Cd 2+ ion are markedly different from the magnitude for changes α λ , which occur for ion Cu 2+ . The interpretation of mismatch dependences obtained α λ ions Cd 2+ and Cu 2+ is carried out within the concept of the availability of different sites, due to the difference in ionic radii (0.1...