摘要
研究了35种7大类抗生素在沱江干流31个采样点河水中浓度的季节和空间变化。研究表明,抗生素广泛存在于沱江干流河水中,其冬季浓度为低于检出限至75.23 ng·L^(−1),夏季浓度为低于检出限至22.42 ng·L^(−1),除了四环素类和β-内酰胺类外,其余抗生素污染浓度有显著季节差异,但大部分抗生素没有呈现出空间差异。在冬季,β-内酰胺类和酰胺醇类抗生素是沱江干流中主要的污染物;而在夏季,四环素类、磺胺类和喹诺酮类抗生素是主要污染物。生态风险评估表明,无论冬夏,磺胺嘧啶、磺胺甲恶唑、左氧氟沙星、氧氟沙星、盐酸金霉素、盐酸四环素对沱江干流生态系统风险最高,为中等至高风险,其余抗生素为低风险,因此,这6种抗生素污染值得重视。
Spatial and seasonal variation of 35 antibiotics belonging to 7 classes were investigated,as well as their associated ecological risk in Tuojiang river.The selected antibiotics were widely detected in the Tuojiang river,with concentrations ranging from below detection limits to 75.23 ng·L^(−1),and from below detection limits to 22.42 ng·L^(−1),respectively in winter and summer.The antibiotics levels in winter were significantly higher than those in summer,with the exception of tetracycline andβ-lactam antibiotics.However,no significant difference in most of antibiotics concentrations were found among upper,middle,and downstream of the Tuojiang river.β-lactam and amphenicol antibiotics were the main pollutants in winter,while sulfonamide,tetracycline,and fluoroquinolone antibiotics were the primary contaminants in summer.According to ecological risk evaluation,sulfadiazine,sulfamethoxazole,levofloxacin,ofloxacin,chlortetracycline hydrochloride,tetracycline hydrochloride displayed middle to high risk to ecosystem,and the rest exhibited low risk.Therefore,further studies should pay attention to these antibiotics.
作者
王若男
曹阳
高超
席英伟
曾晴
熊杰
WANG Ruonan;CAO Yang;GAO Chao;XI Yingwei;ZENG Qing;XIONG Jie(Sichuan Province Ecological Environment Monitoring Station,Chengdu,610074,China;College of Architecture&Environment,Sichuan University,Chengdu,610000,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第8期2505-2514,共10页
Environmental Chemistry
基金
四川省环境保护科技项目(2019HB04)资助.
关键词
抗生素
沱江
时空变化
生态风险
antibiotics
Tuojiang River
spatial and seasonal variation
ecological risk
