State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, China.
Environ Pollut. 2014 Jan;184:579-85. doi: 10.1016/j.envpol.2013.09.038. Epub 2013 Nov 5.
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.
采用批量平衡法研究了铜（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，由于静电竞争，Cu 在 pH<5.0 时抑制了 STZ 在泥炭和土壤上的吸附，而在 pH>5.0 时由于 STZ-Cu 配合物和/或 Cu 桥的形成，增加了 STZ 的吸附。相比之下，Al 仅在 pH<6.0 时降低 STZ 的吸附，而在 pH>6.0 时对 STZ 的吸附影响较小。对于 T，Cu 和 Al 由于三个原因抑制了其在整个 pH 范围内的吸附：1）Cu/Al 和 T(+)之间的静电竞争；2）Cu/Al 的吸附使土壤和泥炭表面的负电荷减少，不利于 T(+)的吸附；3）泥炭和土壤的孔径缩小阻碍了大尺寸 T 的扩散进入这些孔中。
