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论文类型：期刊论文

发表时间：2018-12-15

发表刊物：SCIENCE OF THE TOTAL ENVIRONMENT

收录刊物：PubMed、SCIE、Scopus

卷号：645

页面范围：482-490

ISSN号：0048-9697

关键字：Antibiotics; Environmental waters; Diffusive gradients in thin films; In-situ measurement; Porous carbon material

摘要：Diffusive gradients in thin films (DGT) can achieve the time-weighted-average (TWA) concentrations of analytes in the period of deployment. Here we developed an approach based on DGT with a novel binding gel using porous carbon material (PCM) derived from metal-organic framework (MOF) for in-situ measurement of antibiotics in water samples. The diffusion coefficients of 20 antibiotics (nine sulfonamides, ten fluoroquinolones, and trimethoprim) in agarose diffusive gel were 1.41 x 10(-6) cm(2)/s to 4.75 x 10(-6) cm(2)/s at 25 degrees C. The capacity of PCM binding gel toward the antibiotics was similar to 100 mu g per gel disc. The masses of the antibiotics accumulated by PCM-based DGT increased linearly with time, and they were almost independent of pH (4.2-8.4) and ionic strength (1-500 mM). The performance of the novel DGT was evaluated using freshwater and synthetic seawater spiked with the antibiotics in laboratory. The results showed good agreement with the theoretical predications except sulfacetamide. The detection limits achieved by the DGT with three devices together for deploying up to seven days were 1.0-18.0 ng/L. Field deployment in municipal wastewater treatment plant effluent and seawater showed that the TWA concentrations of antibiotics were 3.8-1342.5 ng/L and 5.6-43.3 ng/L, respectively, which were comparable to those measured by grab sampling. The proposed DGT was an efficient tool for the measurement of antibiotics in environmental waters. (C) 2018 Elsevier B.V. All rights reserved.