摘要
Frontal affinity chromatography was applied to characterizing the mechanism of binding of silver with sediment particulates collected from Lake Ontario, Canada. The results showed that there was one major binding site for Ag+ in the particulates. The binding capacity ranges from 6.06 to 1.01 μ·mol·g-1, and the binding constant (lgK) from 6.23 to 7.43 M-1 in 0.005 M ion strength at pH=3-7. The binding capacity and affinity constant were found to be pH-dependent. It is suggested that the particulate surface site where silver was bound was the anionic base. This study would be helpful for better understanding of the fundamental environmental chemistry of silver in sediments.
Frontal affinity chromatography was applied to characterizing the mechanism of binding of silver with sediment particulates collected from Lake Ontario, Canada. The results showed that there was one major binding site for Ag^＋ in the particulates. The binding capacity ranges from 6.06 to 1.01 μ·mol·g-^1, and the binding constant （lgK） from 6.23 to 7.43 M^-1 in 0.005 M ion strength at pH=3-7. The binding capacity and affinity constant were found to be pH-dependent. It is suggested that the particulate surface site where silver was bound was the anionic base. This study would be helpful for better understanding of the fundamental environmental chemistry of silver in sediments.
基金
the National Natural Science Foundation of China (Grant Nos. 40525011 and 40632011)
the Chinese Academy of Sciences (kzcx2-yw-102)
the International Cooperation Project of CAS for their financial support
