School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255049, China.
School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China.
Ecotoxicol Environ Saf. 2023 Jul 1;259:115002. doi: 10.1016/j.ecoenv.2023.115002. Epub 2023 May 16.
Multiple antibiotics that are used in veterinary medicine coexist in soils, but their interaction and the effects on adsorption and desorption in soils have not been extensively studied. In this study, using batch experiments, we evaluated the adsorption and desorption of sulfadiazine (SDZ), tetracycline (TC), and norfloxacin (NFX) using four different soil aggregate size fractions and discovered that: (1) TC had the highest adsorption (76-98 %) and the lowest desorption in each tested system, whereas SDZ showed opposite adsorption and desorption ability, (2) the highest adsorption and the lowest desorption of all three tested antibiotics were observed with soil macroaggregates (250-2000 µm) in all the cases; in contrast, opposite adsorption and desorption ability were observed for soil clay (<53 µm), and (3) adsorption of each antibiotic was in the following order: single system (71-89 %) > binary system (56-84 %) > ternary system (50-78 %); however, desorption were in the reverse order. The Freundlich equation fitting and Brunauer-Emmett-Teller (BET) analysis further demonstrated that the adsorption competition between the tested antibiotics depended mainly on the specific surface area of each soil aggregate size fractions and its chemical properties. In conclusion, soil macroaggregates play a key role in the retention of antibiotics in soils, and the coexistence of multiple antibiotics greatly increases leaching risk.
多种兽医中使用的抗生素共存于土壤中，但它们在土壤中的相互作用及其对吸附和解吸的影响尚未得到广泛研究。在本研究中，我们使用批量实验，评估了磺胺嘧啶（SDZ）、四环素（TC）和诺氟沙星（NFX）在四种不同土壤团聚体大小分数下的吸附和解吸情况，发现：（1）TC 在每个测试系统中具有最高的吸附（76-98%）和最低的解吸，而 SDZ 表现出相反的吸附和解吸能力；（2）在所有情况下，所有三种测试抗生素的最高吸附和解吸均发生在土壤大团聚体（250-2000μm）中；相反，在土壤粘粒（<53μm）中观察到相反的吸附和解吸能力；（3）每种抗生素的吸附顺序为：单一体系（71-89%）>二元体系（56-84%）>三元体系（50-78%）；然而，解吸顺序相反。Freundlich 方程拟合和 Brunauer-Emmett-Teller（BET）分析进一步表明，测试抗生素之间的吸附竞争主要取决于每个土壤团聚体大小分数的比表面积及其化学性质。总之，土壤大团聚体在土壤中抗生素的保留中起着关键作用，多种抗生素的共存大大增加了淋溶风险。
