Wu Chung-Hsin, Lin Cheng-Fang, Ma Hwong-Wen, Hsi Ting-Qwet
Department of Environmental Engineering and Health, Yuanpei Institute of Science and Technology, 306 Yuanpei Street, Hsinchu, Taiwan ROC.
Water Res. 2003 Feb;37(4):743-52. doi: 10.1016/s0043-1354(02)00391-3.
This work investigated the adsorption of Cu and Pb at the surface of gamma-Al(2)O(3) in the presence of fulvic acid to address the significance of dissolved organic matters on metal partitioning. Fulvic acid, obtained from International Humic Substance Society, represented dissolved organic matter. Fulvic acid concentrations employed herein were 1, 5, and 10 mg C/L, which simulated the relevant environmental conditions. Ion selective electrodes were employed to ascertain free Cu and Pb measurements. The maximum adsorption of 10mg C/L fulvic acid on gamma-Al(2)O(3) was 5 x 10(-2)mgC/mg gamma-Al(2)O(3). Fulvic acid promoted Cu adsorption in low pH conditions. The effects of fulvic acid on Pb adsorption were similar to those of Cu. The conditional stability constants of sorbed fulvic acids with Cu and Pb were determined to be in the order of 4 to 6 (log K). Cu and Pb species were modeled in heterogeneous systems using triple-layer model. Simulation results indicated that metal species are dominantly in complexation with fulvic acid, both in solution and at the gamma-Al(2)O(3) surface.
本研究探讨了在富里酸存在下，γ-Al(2)O(3)表面对铜和铅的吸附情况，以阐明溶解有机物对金属分配的重要性。从国际腐殖质协会获得的富里酸代表溶解有机物。本文采用的富里酸浓度为1、5和10mg C/L，以模拟相关环境条件。使用离子选择性电极确定游离铜和铅的测量值。10mg C/L富里酸在γ-Al(2)O(3)上的最大吸附量为5×10(-2)mgC/mg γ-Al(2)O(3)。富里酸在低pH条件下促进铜的吸附。富里酸对铅吸附的影响与对铜的影响相似。吸附的富里酸与铜和铅的条件稳定常数经测定约为4至6(log K)。使用三层模型对非均相体系中的铜和铅物种进行建模。模拟结果表明，无论是在溶液中还是在γ-Al(2)O(3)表面，金属物种主要与富里酸络合。
