Li Yu, Wang Xiaoli, Guo Shuhai, Dong Deming
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Shenyang 110016, PR China.
Environ Pollut. 2006 Sep;143(2):221-7. doi: 10.1016/j.envpol.2005.11.032. Epub 2006 Feb 7.
Natural surface coatings samples (NSCSs) from the surface of river shingles were employed to investigate the roles of non-residual and residual components of the NSCSs in controlling Cu and Zn adsorption via the selective extraction techniques and statistical analysis. The results indicate that the greatest contribution to metals adsorption on a molar basis was from Mn oxides in the non-residual fraction. Metals adsorption capacities of Mn oxides exceeded those of Fe oxides by one order of magnitude, fewer roles were found attributing to adsorption by organic materials (OM), and the estimated contribution of the residual fraction to metals adsorption was insignificant. These results implied that Mn oxides were the most important component in controlling heavy metals in aquatic environments. Experiments with Cu and Zn adsorption measured together showed that Cu severely interfered with Zn adsorption to the NSCSs and vice versa under the conditions of the two coexisted ions adsorption.
采用从河卵石表面采集的天然表面涂层样品（NSCSs），通过选择性萃取技术和统计分析，研究NSCSs的非残留和残留成分在控制铜和锌吸附方面的作用。结果表明，以摩尔计，对金属吸附贡献最大的是来自非残留部分的锰氧化物。锰氧化物对金属的吸附能力比铁氧化物高出一个数量级，归因于有机物质（OM）吸附的作用较小，且残留部分对金属吸附的估计贡献微不足道。这些结果表明，锰氧化物是控制水生环境中重金属的最重要成分。同时进行的铜和锌吸附实验表明，在两种共存离子吸附的条件下，铜严重干扰锌对NSCSs的吸附，反之亦然。
