Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6317565 | Environmental Pollution | 2014 | 7 Pages |
Abstract
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 pHÂ <Â 5.0 because of the electrostatic competition, while increased STZ adsorption at pHÂ >Â 5.0 due to the formation of STZ-Cu complexes and/or Cu bridge. In contrast, Al only decreased STZ adsorption at pHÂ <Â 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.
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Authors
Zhiguo Pei, Shuang Yang, Lingyun Li, Chunmei Li, Shuzhen Zhang, Xiao-quan Shan, Bei Wen, Baoyuan Guo,