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Use of sunlight to degrade oxytetracycline in marine aquaculture's waters.
Leal, J F; Esteves, V I; Santos, E B H.
Afiliación
  • Leal JF; Department of Chemistry and CESAM, Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal. Electronic address: joanaleal@ua.pt.
  • Esteves VI; Department of Chemistry and CESAM, Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal. Electronic address: valdemar@ua.pt.
  • Santos EBH; Department of Chemistry and CESAM, Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal. Electronic address: edsantos@ua.pt.
Environ Pollut ; 213: 932-939, 2016 Jun.
Article en En | MEDLINE | ID: mdl-27049790
Oxytracycline (OTC) is a broad spectrum antibiotic authorized for use in European aquaculture. Its photo-degradation has been widely studied in synthetic aqueous solutions, sometimes resorting to expensive methods and without proven effectiveness in natural waters. Thus, this work studied the possibility to apply the solar photo-degradation for removal of OTC from marine aquaculture's waters. For that, water samples were collected at different locals of the water treatment circuit, from two different aquaculture companies. Water samples were firstly characterized regarding to pH, salinity, total suspended solids (TSS), organic carbon and UV-Vis spectroscopic characteristics. Then, the samples were spiked with OTC and irradiated using simulated sunlight in order to evaluate the matrix effects on OTC photo-degradation. From kinetic results, the apparent quantum yields and the outdoor half-life times, at 40°N for midsummer and midwinter days were estimated by the first time for these conditions. For a midsummer day, at sea level, the outdoor half-life time predicted for OTC in these aquaculture's waters ranged between 21 and 25 min. Additionally, the pH and salinity effects on the OTC photo-degradation were evaluated and it has been shown that high pH values and the presence of sea salt increase the OTC photo-degradation rate in aquaculture's waters, compared to results in deionised water. The results are very promising to apply this low-cost methodology using the natural sunlight in aquaculture's waters to remove OTC.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxitetraciclina / Fotólisis / Luz Solar / Contaminantes Químicos del Agua / Acuicultura / Purificación del Agua / Antibacterianos Tipo de estudio: Prognostic_studies País/Región como asunto: Europa Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxitetraciclina / Fotólisis / Luz Solar / Contaminantes Químicos del Agua / Acuicultura / Purificación del Agua / Antibacterianos Tipo de estudio: Prognostic_studies País/Región como asunto: Europa Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido