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论文类型：期刊论文

发表时间：2020-01-01

发表刊物：ENVIRONMENTAL POLLUTION

收录刊物：PubMed、EI、SCIE

卷号：256

页面范围：113394

ISSN号：0269-7491

关键字：Tetracyclines (TCs); Desorption kinetics; Soils; Diffusive gradients in thin films technique (DGT)

摘要：Tetracyclines (TCs) are frequently detected in agricultural soils worldwide, causing a potential threat to crops and human health. In this study, diffusive gradients in thin films technique (DGT) was used to measure the distribution and exchange rates of three TCs (tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC)) between the solid phase and solution in five farmland soils. The relationship between the accumulated masses with time suggested that TCs consumption in soil solution by DGT would induce the supply from the soil solid phase. The distribution coefficient for the labile antibiotics (K-dl), response time (T-c) and desorption/adsorption rates (k(b) and k(f)) between dissolved and sorbed TCs were derived from the dynamic model of DIES (DGT induced fluxes in soils). The K-dl showed similar sizes of labile solid phase pools for TC and OTC while larger pool sizes were observed for CTC in the soils. Although the concentrations of CTC were lowest in soil solution, the potential hazard caused by continuous release from soil particles could not be ignored. The long response time (>30 min in most cases) suggested that the resupply of TCs from soil solids was limited by their desorption rates (1.26121 x 10(-6) s(-1)). The soils in finer texture, with higher clay and silt contents (<50 mu m) showed a greater potential for TCs release. (C) 2019 Elsevier Ltd. All rights reserved.