| 郭丽,王淑平,周志强,董俊夫,赵国强.环丙沙星在深浅两层潮土层中吸附-解吸特性研究[J].农业环境科学学报,2014,33(12):2359-2367. |
| 环丙沙星在深浅两层潮土层中吸附-解吸特性研究 |
| Adsorption and Desorption of Ciprofloxacin by Surface and Subsurface Soils of Ustic Cambosols in China |
| 投稿时间：2014-06-04 |
| DOI：10.11654/jaes.2014.12.012 |
| 中文关键词: 环丙沙星 垂直潮土层 吸附 解吸 pH |
| 英文关键词: ciprofloxacin ustic cambosols absorption desorption pH |
| 基金项目:国家自然基金重点项目(41230750);国家高技术研究发展计划(2011AA050105);国家重点基础研究发展计划(2010CB428804-2);中国科学院知识创新工程方向项目(KZCX2-EW-QN606) |
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| 中文摘要: |
| 采用OECD guideline 106批平衡吸附解吸试验方法研究了环丙沙星在潮土0~20 cm和20~40 cm两个垂直土层中的吸附-解吸行为.结果表明,环丙沙星在潮土中的吸附和解吸过程均分为快速反应和慢速平衡两个阶段,且经过24 h达到吸附和解吸平衡.准二级动力学方程能较好地拟合吸附和解吸过程,吸附速率常数为0.571 kg·min-1·mg-1.两个潮土层对环丙沙星的吸附和解吸均不同程度地偏离线性模型,采用Freundlich方程可以对吸附和解吸数据进行良好的非线性拟合(P<0.01),吸附容量分别为672.977和693.426,其吸附等温线属于"S"型等温线.环丙沙星在两个潮土层中吸附以物理吸附为主.在解吸的过程中存在滞后现象,且解吸滞后系数均随着初始浓度的增加而增大,0~20 cm土层的解吸滞后系数均大于20~40 cm土层.在pH 值为4~9 条件下,环丙沙星的吸附参数lg Kd值随pH 的增加先增加后降低,当pH 值为5 时,吸附效果最好,0~20 cm土层lg Kd值为3.36,20~40 cm土层lg Kd值为3.90.阳离子吸附可能是潮土对环丙沙星吸附的主要机制之一. |
| 英文摘要: |
| The behaviors of antibiotics in soils have received increasing attention. In this study, batch adsorption method was employed to reveal adsorption and desorption of antibiotic ciprofloxacin by two different layer soils of ustic cambosols, 0~20 cm surface and 20~40 cm subsoil, following OECD guideline 106. Results showed that the absorption and desorption processes of ciprofloxacin can be divided into two stages:fast reaction and slow balance, and followed the pseudo-second-order kinetics,with adsorption rate of 0.571 kg·min-1·mg-1. After 24 h the absorption and desorption reached balance. Freundlich model best described all experimental data of adsorption and desorption(P<0.01). The adsorption capacity(Kf) was 672.977 and 693.426 for surface and subsurface soils, respectively. The mechanism of ciprofloxacin adsorption was primarily physical adsorption in soils. There was hysteresis in desorption. Hysteresis index(HI) of ciprofloxacin increased with increasing initial concentration. The HI was greater in 0~20 cm than in 20~40 cm soil layer. In adsorption, lg Kd values increased with pH increasing from 4 to 5 and then reduced with further increase in pH, with absorption peak appeared at pH 5, The lg Kd value at pH 5 was 3.36 for 0~20 cm soil layers and 3.90 for 20~40 cm soil layers. In conclusion, cationic adsorptions might be one of the main sorption mechanisms for ciprofloxacin in two soil layers. |
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