COMPLEXATION OF TRACE-METALS BY ADSORBED NATURAL ORGANIC-MATTER
COMPLEXATION OF TRACE-METALS BY ADSORBED NATURAL ORGANIC-MATTER
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DOI：
10.1016/0016-7037(84)90095-4
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发表时间：
1984-01-01
影响因子：
5
通讯作者：
DAVIS, JA
中科院分区：
文献类型：
--
作者：
DAVIS, JA
研究了胶体氧化铝颗粒和溶解性天然有机物模型体系中Cu（II）和Cd（II）的吸附行为和溶液形态。在平衡状态下，氧化铝表面的一个重要部分被吸附的有机物所覆盖。铜（II）主要分配之间的表面结合的有机物和溶解在水相中的铜-有机络合物。Cu ~（2+）与吸附有机物官能团的络合作用强于与未覆盖氧化铝表面羟基的络合作用。它示出的络合的Cu（II）吸附的有机物可以描述由一个表观稳定常数约等于溶液相平衡的值。与此相反，Cd（II）的吸附没有显着影响的存在下，在表面上的有机物，由于弱络合物的形成与有机配体。结果表明，一般的微量元素在天然沃茨中的分配模型必须考虑吸附有机物的存在。
The adsorption behavior and solution speciation of Cu(II) and Cd(II) were studied in model systems containing colloidal alumina particles and dissolved natural organic matter. At equilibrium a significant fraction of the alumina surface was covered by adsorbed organic matter. Cu(II) was partitioned primarily between the surface-bound organic matter and dissolved Cu-organic complexes in the aqueous phase. Complexation of Cu2+with the functional groups of adsorbed organic matter was stronger than complexation with uncovered alumina surface hydroxyls. It is shown that the complexation of Cu(II) by adsorbed organic matter can be described by an apparent stability constant approximately equal to the value found for solution phase equilibria. In contrast, Cd(II) adsorption was not significantly affected by the presence of organic matter at the surface, due to weak complex formation with the organic ligands. The results demonstrate that general models of trace element partitioning in natural waters must consider the presence of adsorbed organic matter.