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The Analysis of the Quenching Efficiency of Humic Acid Fluorescence by Cadmium and Copper Ions

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Nikolay L. Lavrik, Nurullo U. Mulloev
In conditions of monochromatic excitation (λexc=337.1), the spectral dependence of the efficiency of fluorescence quenching αλ of humic acids samples by Cd2+ and Cu2+ ions was studied. The difference of αλ dependencies for these ions was established. In the spectral range 350 - 650 nm, changes of the αλ for Cd2+ ion are markedly different from the magnitude for changes αλ, which occur for ion Cu2+. The interpretation of mismatch dependences obtained αλ ions Cd2+ and Cu2+ is carried out within the concept of the availability of different sites, due to the difference in ionic radii (0.108 nm and 0.08 nm for Cd2+ and Cu2+, respectively).
Cite this paper
Lavrik, N. and Mulloev, N. (2014) The Analysis of the Quenching Efficiency of Humic Acid Fluorescence by Cadmium and Copper Ions. American Journal of Analytical Chemistry, 5, 1167-1173. doi: 10.4236/ajac.2014.517123.

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