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The interaction of cadmium (Ⅱ) ion with quercetin and (+)-catechin was investigated in aqueous solution at various pH. The flavonoid/cadmium stochiometries for cadmium (Ⅱ) binding to quercetin and (+)-catechin have been determined by UV-vis spectroscopy. 1 : 1 Cd (Ⅱ)-Flavonoid complex had a maximum absorbance and showed the bathochromic shift of the long-wavelength band of the UV-vis spectra in the alkaline pH, that occurs upon complexation, due to a ligandto-metal charge transfer. These results suggest that Cd (Ⅱ)-flavonoid complex has the optimal condition of chelation in 0.2 M NH3 - 0.2 M NH4Cl (pH 8.0) solution.