TITLE:
The Analysis of the Quenching Efficiency of Humic Acid Fluorescence by Cadmium and Copper Ions
AUTHORS:
Nikolay L. Lavrik, Nurullo U. Mulloev
KEYWORDS:
Structure of Humic Acids, Spectral Dependence of Fluorescence Quenching, Cd2+ and Cu2+ Ions
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.5 No.17,
December
4,
2014
ABSTRACT: 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).