Effects of copper and aluminum on the adsorption of sulfathiazole and tylosin on peat and soil
Effects of copper and aluminum on the adsorption of sulfathiazole and tylosin on peat and soil
复制标题
铜和铝对泥炭和土壤吸附磺胺噻唑和泰乐菌素的影响
DOI：
10.1016/j.envpol.2013.09.038
复制
发表时间：
2014-01-01
影响因子：
8.9
通讯作者：
Guo, Baoyuan
中科院分区：
文献类型：
--
作者：
Pei, Zhiguo;Yang, Shuang;Guo, Baoyuan
采用静态平衡法研究了铜（Cu）和铝（Al）对磺胺噻唑（STZ）和泰乐菌素（T）在泥炭和土壤上吸附的影响。结果表明，在pH < 5.0时，铜离子通过静电竞争抑制了STZ在泥炭和土壤上的吸附，而在pH > 5.0时，铜离子通过形成STZ铜络合物和/或铜桥促进了STZ在泥炭和土壤上的吸附。在pH < 6.0时，Al只降低STZ的吸附量，而在pH>6.0时，Al对STZ的吸附影响不大。在整个pH范围内，Cu和Al均抑制了T的吸附，其原因有3个：1）Cu/Al与T+之间的静电竞争; 2）Cu/Al吸附使土壤和泥炭表面的负电荷减少，不利于T+的吸附; 3）泥炭和土壤的孔隙缩小，阻碍了大粒径T向孔隙中的扩散。(C)2013爱思唯尔有限公司保留所有权利。
Effects of copper (Cu) and aluminum (Al) on the adsorption of sulfathiazole (STZ) and tylosin (T) to peat and soil were investigated using a batch equilibration method. Results show that Cu suppressed STZ adsorption onto peat and soil at pH < 5.0 because of the electrostatic competition, while increased STZ adsorption at pH > 5.0 due to the formation of STZ Cu complexes and/or Cu bridge. In contrast, Al only decreased STZ adsorption at pH < 6.0, and exerted slight effect on STZ adsorption at >6.0. As for T, both Cu and Al suppressed its adsorption over the entire pH range owing to three reasons: 1) electrostatic competition between Cu/Al and T+; 2) Cu/Al adsorption made the soil and peat surface less negatively charged, which was unfavorable for T+ adsorption; 3) the shrunken pore size of peat and soil retarded the diffusion of large-sized T into these pores. (C) 2013 Elsevier Ltd. All rights reserved.