交沙霉素在土壤中的吸附特性及垂向迁移机制  

Adsorption Characteristics and Vertical Migration Mechanism of Josamycin in Soil

作　　者：袁涛[1,2] 瞿旭 任峰 路平 YUAN Tao;QU Xu;REN Feng;LU Ping(School of Architectural Intelligence,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江苏建筑职业技术学院建筑智能学院,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《环境科学与技术》2021年第9期135-143,共9页Environmental Science & Technology

基　　金：江苏高校青蓝工程项目(苏教师函[2020]10号);江苏省建筑节能与建造技术协同创新中心博士后基金项目(XT2021BH002)。

摘　　要：文章针对畜禽养殖基地大环内酯类抗生素的污染问题,研究了交沙霉素(JOS)的吸附动力学、热力学特性以及垂向迁移机制,并基于土壤吸附和土柱迁移试验,得出以下结论:(1)吸附动力学实验表明,第16小时达到吸附平衡状态,Elovich方程能够更好地拟合土壤中JOS的动力学吸附过程。等温吸附实验表明,Freundlich模型对土壤中JOS的等温吸附过程拟合效果更好,最大吸附容量为187.74 mg/kg。(2)增大抗生素初始浓度对土壤吸附JOS起促进作用;土壤溶液pH为7.5时吸附能力最强;Ca^(2+)对土壤吸附JOS的抑制作用强于Na^(+),而Fe^(3+)对土壤吸附JOS有明显的促进作用。(3)增加施药量能提高JOS在土柱中的垂向迁移能力,偏中性的淋溶液对土柱试验结果影响很小,碱性环境较中性环境更利于JOS垂向迁移。Fe^(3+)对JOS在土柱中垂向迁移有明显抑制作用,Ca^(2+)对JOS在土柱中垂向迁移的促进作用较强。研究结果可为土壤抗生素污染防治与风险评价提供科学依据。In order to solve the pollution problem of macrolide antibiotics in livestock and poultry breeding bases,the adsorp⁃tion kinetics,adsorption thermodynamics and vertical migration mechanism of josamycin(JOS)were studied.Based on soil adsorption experiments and soil column migration tests,the results indicated that the kinetic adsorption experiments showed that the adsorption equilibrium state was reached at the 16th hour,and the Elovich equation could better fit the dynamic adsorption process of JOS in the soil.Isothermal adsorption experiments show that Freundlich model has a better fitting effect on the isothermal adsorption process of JOS in soil,with the maximum adsorption capacity as 187.74 mg/kg.Factor analysis showed that increasing the initial concentration of antibiotics promoted soil JOS adsorption.The adsorption capacity was the highest when the pH of soil solution was 7.5.The inhibition effect of Ca^(2+) on soil JOS adsorption was stronger than that of Na^(+),while the promotion effect of Fe^(3+) was obvious.The leaching test of the soil column showed that vertical migration ability of JOS in soil column could be improved by increasing the application amount.The neutral leaching solution has little effect on the soil column test results,and the alkaline environment is more conducive to the vertical migration of JOS than the neutral environment.Fe^(3+)significantly inhibited the vertical migration of JOS in soil columns,while Ca^(2+) significantly promoted the vertical migration of JOS in soil columns.The results provide a scientific basis for the prevention and control of soil antibiotic contamination and risk assessment.

关 键 词：土壤 交沙霉素 吸附特性 垂向迁移 

分 类 号：X131.3[环境科学与工程—环境科学]