北京地区潮土对土霉素的吸附特性研究

北京近1/4区域土壤属于潮土，潮土对四环素类抗生素的吸附特性还鲜有报道。采用OECD Guideline 106的方法，研究土霉素在北京地区潮土上的吸附特性。结果表明，土霉素在潮土中的吸附动力学过程符合Elovich方程，土霉素初始浓度会影响吸附速率，2 mg/L时最大，10 mg/L时最小。吸附百分比随着初始浓度的升高，先增大后减小。温度和平均吸附速率呈负相关。实验浓度下，吸附等温线符合线性等温方程和Freundlich方程，吸附是自发的吸热反应。潮土对土霉素的吸附量和粉粒及黏粒含量之和呈正相关。土霉素在潮土中的吸附受初始浓度、温度、土壤性质等因素的影响，深入了解其作用机理，有助于防治土霉素污染，保护土壤安全。

Adsorption Analysis of Oxytetracycline on Fluvo-aquic Soils in Beijing

Nearly 25% of the total area in Beijing is fluvo-aquic soils, whose adsorption characteristics of tetracycline antibiotics have not been investigated. This research, with the help of OECD Guideline 106, investigated the absorption characteristics of oxytetracycline in the fluvo-aquic soils in Beijing. Our research found that the adsorption kinetics of oxytetracycline in the fluvo-aquic soils is correspond to Elovich equation. The initial concentration of oxytetracycline will affect the adsorption rate. Absorption rate reaches the maximum when the concentration is 2 mg/L and the minimum when 10 mg/L. For absorption percentage, as initial concentration increases, the adsorption percentage first increases and then decreases. The relationship between temperature and average absorption rate is negatively correlated. In our experimental context, the adsorption isotherm is consistent with both linear adsorption isotherm equation and Freundlich isotherm equation. The adsorption is a spontaneous endothermic reaction. Fluvo-aquic soils adsorption capacity of oxytetracycline has a positive relation with the content of silt and clay. Adsorption of oxytetracycline on fluvo-aquic soils was affected by initial concentration, temperature, and soil properties. It is helpful to control pollution of oxytetracycline and protect soils if the mechanisms are understood deeply.