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Adsorption and desorption of three tetracycline antibiotics in cinnamon soils of China. |
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Abstract On the basis of the OECD Guideline 106, batch adsorption methods were employed to reveal the adsorption and desorption process of three tetracycline antibiotics in cinnamon soils. The Freundlich model was the best isotherm to describe all experimental datas of adsorption and desorption, and the average fitting correlation coefficient was 0.991. Among three antibiotics, chlortetracycline adsorption isotherms resembled S-type curves, oxytetracycline adsorption isotherms resembled the L-type curves, and tetracycline adsorption isotherms resembled the linear curves according to adsorption strength (1/n). For two soils, the adsorption capacity (lgKf) was in the order chlortetracycline (4.003 and 4.307) > tetracycline (3.198 and 3.252) > oxytetracycline (2.724 and 2.932). The dominant mechanism of three tetracycline antibiotics adsorption was physical adsorption in cinnamon soils. HI of oxytetracycline was significantly higher than that of tetracycline and chlortetracycline (P0.05) between tetracycline and chlortetracycline for HI.
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Received: 26 February 2010
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