Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium and properties of sediments and soils |
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Authors: | Guixiang Zhang Xitao Liu Ke Sun Ye Zhao and Chunye Lin |
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Institution: | (1) The Hydro-chemistry Laboratory, Geography and the Environment, Tel Aviv University, Tel Aviv, 69978, Israel;(2) School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel;(3) The Porter School for Environmental Studies, Tel Aviv University, Tel Aviv, 69978, Israel |
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Abstract: | Batch sorption experiments were conducted to evaluate the sorption behavior of tetracycline (TC, H3L) on sediments and soils in the presence and absence of cadmium (Cd), as affected by pH and properties of sediments and soils.
The results indicated stronger nonlinearity and higher capacity of TC sorption on sediments than on soils. Sorption of TC
also strongly depended on environmental factors and sediment/soil properties. Lower pH facilitated TC sorption through a cation
exchange mechanism, which also took place at pH values above 5.5, where TC existed as a zwitterion (H2L0) or anions (HL? and L2?). When pH was above 7, however, ligand-promoted dissolution of TC might occur due to TC weakening the Al-O bond of aluminum
oxide and the Fe-O bond of iron oxide. Natural organic matter (NOM) plays a more important role in TC sorption than cation
exchange capacity (CEC) and clay contents. The presence of Cd (II) increased TC sorption on both sediments and soils, which
resulted from the decrease of equilibrium solution pH caused by Cd2+ exchange with H+ ions of sediment/soil surfaces. The increase of TC sorption was also related to the formation of TC-Cd complexes, where Cd2+ acted as a bridge between the sediment/soil and TC. |
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