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摘要
The processes and pH effects on adsorption and desorption of doxycycline (DC) in Wushantu soil, atypical soil in the TaiHu lake area, China, were investigated by batch balance experiments. The results showed that linear model equations were optimal in describing the DC adsorption process in the soil, and the calculated K-d and K-oc from the equations were relatively high, with values of 301.95 L kg(-1) and 14242.92 L kg(-1), respectively, which displayed little mobility and a leaching rate of DC existed in the soil. And the hysteresis of DC desorption in the soil was assessed by a single adsorption-desorption test, the hysteresis index obtained from the test was 2.57, indicating a significant lag in desorption process. Moreover, DC adsorption on the soil was favored in low pH condition, while inhibited in high pH condition with a relative low adsorption capacity. Analysis of the relationship between the DC cation fraction and DC adsorption capacity in low pH showed that a strong correlation occurred between the cation fraction and partitioning coefficient, demonstrating that DC cations can significantly enhance the total amount of adsorbed DC. So a conclusion was given that DC could not affect the quality of the drinking water sources in the TaiHu lake area.
- 出版日期2015
- 单位环境保护部南京环境科学研究所; 江苏大学
