全文下载：2013020136
张景环1,2
(1. 青岛科技大学 环境与安全工程学院，山东 青岛 266042;
2. 北京师范大学 环境模拟与污染控制国家重点联合实验室，北京 100875)
摘要： 通过静态吸附实验，研究了水稻土和赤红壤不同有机组分颗粒物（DOC去除、NaOH提取、375 ℃灼烧和600 ℃灼烧）对诺氟沙星的吸附行为。结果表明，DOC去除颗粒物的总有机碳含量(TOC)最高，其他颗粒物的TOC从原始土壤到600 ℃灼烧后颗粒物逐渐减小。所有土壤不同有机组分颗粒物对诺氟沙星的吸附均表现为非线性吸附，Freundlich模型对吸附数据的拟合效果很好，并且其吸附非线性程度均比原始土壤高。其中，375 ℃灼烧后颗粒物具有最强的吸附非线性特征，吸附非线性参数n值分别为0.517(水稻土)和0.592(赤红壤)。水稻土不同有机组分颗粒物对诺氟沙星的吸附能力均高于赤红壤。与原始土壤相比，DOC去除和NaOH提取颗粒物的Koc值（ce=0.1 mg·L-1）减小，说明其吸附能力降低。相反，375 ℃灼烧后颗粒物对诺氟沙星Koc值最大，说明其吸附能力最强，而600 ℃灼烧后的颗粒物的吸附能力最弱。
关键词： 诺氟沙星; 吸附; 有机碳; 土壤; 吸附系数Koc
中图分类号： X 131.3 文献标志码： A
Study of Norfloxacin Sorptions by Organic Species in the Soils
HANG Jing-huan1,2
(1.CollegeofEnvironmentand Safety Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China;
2. State Key Joint Laboratory of Environment Simulation and Pollution control,
SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,China)
Abstract: Sorption isotherms of norfloxacin (NOF) on different organic fractions from a paddy soil and a latosolic red soil (DOC removed, NaOH extracted,375 ℃heated and600 ℃heated) were determined to compare their sorption behavior for NOF. The TOC content decreased from original soil to the particles heated at600 ℃, except that the DOC removed particles had the highest TOC. All sorption isotherms of NOF were nonlinear and fitted well by the Freundlich model. The sorption nonlinearity of NOF on all different fractions was higher than the original soils. The particles heated at375 ℃exhibited the most nonlinear sorption for NOF, with n values of 0.517 (paddy soil) and 0.592 (latosolic red soil). The different organic fractions of the paddy soil showed stronger sorption for NOF than the latosolic red soil. Compared to original soils, the Koc values (ce=0.1 mg·L-1) of DOC removed and NaOH extracted particles reduced, revealing the decrease of their sorption capacity for NOF. In contrast, the375 ℃heated particles had the highest Koc values, indicating the strongest sorption for NOF. However, the600 ℃heated particles exhibited the lowest sorption capacity.
Key words:norfloxacin; sorption; organic carbon; soil; Koc
收稿日期：2012-05-28
基金项目：国家自然科学基金课题项目（21107063）；环境模拟与污染控制国家重点联合实验室（北京师范大学）开放课题专项项目（10K05ESPCN）.
作者简介：张景环（1982—），女，博士，讲师.
