Competitive adsorption and desorption of tetracycline and sulfadiazine in crop soils

Raquel Cela-Dablanca; Ana Barreiro-Buján; Gustavo Ferreira-Coelho; Lucia Rodríguez López; Vanesa Santás-Miguel; Manuel Arias-Estévez; Avelino Núñez-Delgado; María J Fernández-Sanjurjo; Esperanza Álvarez-Rodríguez

doi:10.1016/j.envres.2022.113726

Competitive adsorption and desorption of tetracycline and sulfadiazine in crop soils

Environ Res. 2022 Nov;214(Pt 1):113726. doi: 10.1016/j.envres.2022.113726. Epub 2022 Jun 22.

Authors

Raquel Cela-Dablanca¹, Ana Barreiro-Buján², Gustavo Ferreira-Coelho², Lucia Rodríguez López³, Vanesa Santás-Miguel³, Manuel Arias-Estévez³, Avelino Núñez-Delgado², María J Fernández-Sanjurjo², Esperanza Álvarez-Rodríguez²

Affiliations

¹ Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Univ. Santiago de Compostela, 27002, Lugo, Spain. Electronic address: raquel.dablanca@usc.es.
² Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Univ. Santiago de Compostela, 27002, Lugo, Spain.
³ Soil Science and Agricultural Chemistry, Fac. Sciences, Univ. Vigo, 32004, Ourense, Spain.

PMID: 35750125
DOI: 10.1016/j.envres.2022.113726

Abstract

In view of the environmental issues caused by antibiotics, this research studies competitive adsorption/desorption for tetracycline (TC) and sulfadiazine (SDZ) in agricultural soils. Competitive adsorption was studied in binary systems (adding equal concentrations of both antibiotics). In addition, it was compared with results from simple systems. In all cases, batch-type adsorption/desorption experiments were carried out. In the binary systems, for the highest antibiotic concentration added, adsorption percentages were always higher for TC (close to 100%) than for SDZ (10-90%). In these systems, TC desorption was lower than 5% for all soils, and generally <10% for SDZ. Comparing TC and SDZ adsorption for the different systems, SDZ was clearly affected by the presence of TC, with SDZ adsorption percentages being was much higher (with differences generally above 65%) in the binary than in the simple systems. On the contrary, comparing the results of TC adsorption in simple and binary systems, TC was not affected by the presence of SDZ, obtaining similar adsorption percentages in both systems. K_d and K_F values (in the Linear and Freundlich models), were higher in the simple systems in the case of TC, which could be due to competition with SDZ, while for SDZ K_d and K_F were higher in the binary systems, with a synergistic effect of TC favoring SDZ adsorption. Regarding desorption, it reached 100% for SDZ in some soils in simple systems, dropping to 10% in the presence of TC. TC desorption was <4%, not affected by SDZ. The results indicate that environmental risks would be higher for SDZ, showing differences when both antibiotics are present. This can be considered relevant as regards public health and environmental preservation, in view of direct toxicities and the promotion of resistance to antibiotics associated with the presence of these contaminants in the environment.

Keywords: Agriculture; Antibiotics; Emerging pollutants; Release; Retention.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Anti-Bacterial Agents
Soil Pollutants*
Soil*
Sulfadiazine
Tetracycline

Substances

Anti-Bacterial Agents
Soil
Soil Pollutants
Sulfadiazine
Tetracycline