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Effect of soil organic matter on adsorption and desorption of oxytetracycline in soils |
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Abstract Batch equilibrium experiments were used to investigate the adsorption and desorption of oxytetracycline (OTC) in cinnamon soil and red soil with or without soil organic matter (SOM). Results showed that all adsorption and desorption isotherms were of deviation from the linear model. All experimental adsorption and desorption data could be best described by the Freundlich model, and all coefficients (r) were up to a very significant correlation. Removal of SOM could reduce OTC adsorption capacity (lgKf) and increase OTC adsorption strength (1/n) in soil. The apparent adsorption-desorption hysteresis was found with the average hysteresis index (HIa) 0.039 and 0.015 in cinnamon soil and red soil. The removal of SOM could significantly increase HIa (P <0.01) in cinnamon soil and red soil to 0.068 and 0.028, respectively.
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Received: 07 November 2008
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