Environmental Pollution 2014-01-01

Effects of copper and aluminum on the adsorption of sulfathiazole and tylosin on peat and soil.

Zhiguo Pei, Shuang Yang, Lingyun Li, Chunmei Li, Shuzhen Zhang, Xiao-quan Shan, Bei Wen, Baoyuan Guo

Index: Environ. Pollut. 184 , 579-85, (2014)

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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 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. Copyright © 2013 Elsevier Ltd. All rights reserved.