期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 651, 期 -, 页码 1653-1660出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.09.323
关键词
Diffusive gradients in thin films; Nano-sized zinc oxide; In situ; Sampling; Tetracyclines
资金
- NSFC [21477082, 21777021, 21547015]
- Public Welfare Scientific Research project of Liaoning province of China [20170008]
- Doctoral Scientific Research Foundation of Liaoning province of China [20170520149]
- Fundamental Research Funds for central universities [N162410002-8]
The pollution of antibiotics, including tetracyclines (TCs), in aquatic environments has become an issue of concern in recent years. Herein, an in situ sampling of TCs in pig breeding wastewater that utilizes the technique of diffusive gradients in thin films (DGT), based on commercial nanosized ZnO (nanoZnO) particles as the potential effective binding agent and a polyethersulfone (PES) membrane as the diffusion layer, was developed. The diffusion coefficients of tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) in a PES membrane at 25 degrees C were (1.37 +/- 0.06) x 10(-6) cm(2) s(-1), (1.29 +/- 0.05) x 10-6 cm(2) s(-1) and (1.94 +/- 0.07) x 10(-6) cm(2) s(-1), respectively. The results showed that the adsorption capacities of a gel disc containing 2.5 g L-1 of nanoZnO particles were as high as 3.93 +/- 0.20 mg disc(-1) for TC, 3.21 +/- 0.20 mg disc(-1) for OTC and 4.62 +/- 0.22 mg disc(-1) for CTC. Both a solution pH in the range of 5-9 and an ionic strength (as pNaCl) in the range of 1-3 had an insignificant influence on the TCs uptake by nanoZnO-DGT samplers. There was no significant influence of fulvic acid or tannic acid on the TC uptake by nanoZnO-DGT samplers at the tested mass ratios. For all spiked freshwater samples, there was no notable interference of matrices on the performance of the nanoZnO-DGT samplers, suggesting that the nanoZnO-DGT samplers yielded satisfactory results for the uptake of TCs at concentrations existing in the spiked freshwater samples. Field deployment of the nanoZnO-DGT samplers in pig breeding wastewater also exhibited excellent precision and accuracy, indicating that the nanoZnO-DGT samplers could be used as a promising method for the in situ sampling of TC antibiotics in aquatic environments. (C) 2018 Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据