title: Effects of copper and aluminum on the adsorption of sulfathiazole and tylosin on peat and soil.
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.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, China. Electronic address: peizg@rcees.ac.cn.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Pei
authors.forename: Shuang
authors.initials: S
authors.lastname: Yang
authors.forename: Lingyun
authors.initials: L
authors.lastname: Li
authors.forename: Chunmei
authors.initials: C
authors.lastname: Li
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
authors.forename: Xiao-quan
authors.initials: XQ
authors.lastname: Shan
authors.forename: Bei
authors.initials: B
authors.lastname: Wen
authors.forename: Baoyuan
authors.initials: B
authors.lastname: Guo
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D000077589:Sulfathiazole; D013432:Sulfathiazoles / Q000032:analysis / Q000737:chemistry*; D015645:Tylosin / Q000032:analysis / Q000737:chemistry*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D013432:Sulfathiazoles; D003300:Copper; D000535:Aluminum; D000077589:Sulfathiazole; D015645:Tylosin
keywords: Adsorption; Aluminum; Copper; Sulfathiazole; Tylosin