薄膜中的扩散梯度
离子强度
单宁酸
锌
土霉素
吸附
化学
膜
废水
环境化学
色谱法
分析化学(期刊)
核化学
环境工程
抗生素
环境科学
物理化学
有机化学
水溶液
生物化学
金属
作者
Nan You,Hui Yao,Yun Wang,Hong‐Tao Fan,Changsong Wang,Ting Sun
标识
DOI:10.1016/j.scitotenv.2018.09.323
摘要
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 °C were (1.37 ± 0.06) × 10−6 cm2 s−1, (1.29 ± 0.05) × 10−6 cm2 s−1 and (1.94 ± 0.07) × 10−6 cm2 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.
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