冻融过程中抗生素环丙沙星的冰-水分布规律  

Ice-water distribution pattern of the antibiotic ciprofloxacin during freeze-thaw process

作　　者：葛林科 李璇艳 魏文斌 罗丽婷 张蓬 张会强 贾佳 周弛 GE Linke;LI Xuanyan;WEI Wenbin;LUO Liting;ZHANG Peng;ZHANG Huiqiang;JIA Jia;ZHOU Chi(Shaanxi Key Laboratory for Environmental Monitoring and Forewarning of Trace Pollutants,Shaanxi Provincial Environmental Monitoring Center Station,Xi’an 710054,China;School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China;Lancaster Environment Centre,Lancaster University,Lancaster LA14YQ,United Kingdom)

机构地区：[1]陕西省环境监测中心站陕西省环境介质痕量污染物监测预警重点实验室,陕西西安710054 [2]陕西科技大学环境科学与工程学院,陕西西安710021 [3]Lancaster Environment Centre,Lancaster University,Lancaster LA14YQ,United Kingdom

出　　处：《海洋环境科学》2024年第6期919-926,共8页Marine Environmental Science

基　　金：陕西省环境介质痕量污染物监测预警重点实验室开放基金项目(SHJKFJJ202318);陕西省重点研发计划资助项目(2024SF-YBXM-567);国家自然科学基金项目(21976045,22076112);中国国家留学基金项目(202308610123)。

摘　　要：抗生素由于广泛生产、使用和排放,持续输入水环境中,并作为新污染物在表层水体中被频繁检出。水体的季节性冻融是中、高纬度地区普遍存在的自然现象,目前已在结冰的河流、水库中发现抗生素的存在。为揭示结冰水体中抗生素环丙沙星(ciprofloxacin,CIP)的冰-水分布规律,本研究模拟了静态水体自上而下的冻结过程,发现CIP会在冰、水两相间进行再分配,由于冷冻浓缩效应,仅有少量CIP被捕获在冰体中,而大部分会从冰中排出并迁移至冰下水,使得CIP呈现出明显的冰-水分布规律。CIP初始浓度、环境温度、冻结时间和盐度通过影响冰生长速率、溶质扩散速率和冰体结构,从而改变CIP在冰-水体系中的分布,其中盐度的增加会阻碍CIP向冰下水体迁移。融冰过程中,在外界热量的作用下,冰体紧密的结构被破坏,冰裂隙增大使CIP出现早期洗脱现象。综上所述,CIP的冰-水分布规律受环境因素影响较大,冰下水中浓度明显高于冰中,冰融化时CIP会优先释放。本研究结果有助于理解寒冷地区结冰水体中抗生素类新污染物的分布和迁移,为准确评价冰下水中污染物的风险提供依据。Due to extensive production,use and discharge,antibiotics continue to be released into the aquatic environment and are frequently detected as emerging contaminants in surface waters.Seasonal freeze-thaw of water bodies is a common natural phenomenon in mid and high latitudes,and antibiotics have been detected in frozen rivers and reservoirs.To reveal the ice-water distribution of the antibiotic ciprofloxacin(CIP)in frozen water,the simulation experiments were conducted on the top-down natural freezing process of static water bodies.It was found that CIP was redistributed between the ice and water phases.Due to the freezingconcentration effect,only a small amount of CIP was trapped in the ice,while the majority of CIP was released from the ice and migrated to the water under the ice,resulting in a clear ice-water distribution pattern of CIP.The initial CIP concentration,freezing temperature,freezing time and salinity affected the ice growth rate,solute diffusion rate and ice structure,thereby altering the distribution of CIP in the ice-water system.The increase in salinity hindered the migration of CIP to the water under the ice.During the ice melting process,the compact structure of the ice was destroyed under the external heat,and the ice cracks increased so that the CIP showed early elution.In conclusion,the ice-water distribution pattern of CIP is greatly influenced by environmental factors,and the concentration in water under ice is significantly higher than that in ice,and CIP will be preferentially released when ice melts.The results of this study contribute to understanding the distribution and migration of antibiotic pollutants in frozen water in cold regions,and provide a basis for accurately evaluating the risk of pollutants in subglacial waters.

关 键 词：新污染物 抗生素 环丙沙星 冰-水体系 分布 

分 类 号：X131[环境科学与工程—环境科学]