Cela-Dablanca Raquel, Barreiro Ana, Rodríguez-López Lucia, Santás-Miguel Vanesa, Arias-Estévez Manuel, Fernández-Sanjurjo María J, Álvarez-Rodríguez Esperanza, Núñez-Delgado Avelino
Department Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University Santiago de Compostela, 27002 Lugo, Spain.
Soil Science and Agricultural Chemistry, Faculty Sciences, University Vigo, 32004 Ourense, Spain.
Materials (Basel). 2022 Apr 28;15(9):3200. doi: 10.3390/ma15093200.
The antibiotic amoxicillin (AMX) may reach soils and other environmental compartments as a pollutant, with potential to affect human and environmental health. To solve/minimize these hazards, it would be clearly interesting to develop effective and low-cost methods allowing the retention/removal of this compound. With these aspects in mind, this work focuses on studying the adsorption/desorption of AMX in different agricultural soils, with and without the amendment of three bio-adsorbents, specifically, pine bark, wood ash and mussel shell. For performing the research, batch-type experiments were carried out, adding increasing concentrations of the antibiotic to soil samples with and without the amendment of these three bio-adsorbents. The results showed that the amendments increased AMX adsorption, with pine bark being the most effective. Among the adsorption models that were tested, the Freundlich equation was the one showing the best fit to the empirical adsorption results. Regarding the desorption values, there was a decrease affecting the soils to which the bio-adsorbents were added, with overall desorption not exceeding 6% in any case. In general, the results indicate that the bio-adsorbents under study contributed to retaining AMX in the soils in which they were applied, and therefore reduced the risk of contamination by this antibiotic, which can be considered useful and relevant to protect environmental quality and public health.
抗生素阿莫西林（AMX）可能作为一种污染物进入土壤和其他环境介质，有可能影响人类健康和环境。为了解决/最小化这些危害，开发有效且低成本的方法来保留/去除这种化合物显然会很有意义。考虑到这些方面，本研究聚焦于探究AMX在不同农业土壤中的吸附/解吸情况，这些土壤添加或未添加三种生物吸附剂，即松树皮、木灰和贻贝壳。为开展该研究，进行了批次型实验，向添加和未添加这三种生物吸附剂的土壤样品中加入浓度不断增加的抗生素。结果表明，添加物增加了AMX的吸附，其中松树皮最为有效。在所测试的吸附模型中，弗伦德利希方程最能拟合实验吸附结果。关于解吸值，添加了生物吸附剂的土壤的解吸有所降低，无论何种情况总体解吸均不超过6%。总体而言，结果表明所研究的生物吸附剂有助于将AMX保留在所施用的土壤中，因此降低了这种抗生素的污染风险，这对于保护环境质量和公众健康而言是有用且重要的。
