Modificación de la solubilidad aparente del hexaclorociclohexano (hch) mediante la aplicación de líquidos iónicos y surfactantes para su potencial aplicación en remediación de suelos
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La baja biodisponibilidad del hexaclorociclohexano (HCH) afecta a la efectividad de procesos de biorremediación de suelos contaminados por HCH. Para aumentar la solubilidad aparente del HCH y potenciar su biodisponibilidad, se estudió el efecto de la acción micelar de una gran variedad de líquidos iónicos con actividad surfactante (i.e. Surface-Active Ionic Liquids o SAILs) y surfactantes convencionales sobre la solubilidad de HCH. Se prepararon disoluciones de SAILs/surfactantes y HCH (a una concentración ca. 10 veces su límite de solubilidad) utilizando dos concentraciones distintas de SAILs/surfactantes (siempre >CMC). Los resultados varían según el isómero de HCH, el SAIL/surfactante y la concentración utilizada. De forma adicional, se estudió la ecotoxicidad de los SAILs/surfactantes en dos especies vegetales. Este estudio demuestra la potencialidad de los SAILs y surfactantes para su aplicación en biorremediación de suelos contaminados por HCH y propone varios SAILs para futuras investigaciones.
The low bioavailability of hexachlorocyclohexane (HCH) affects the effectiveness of bioremediation processes of HCH-contaminated soils. The effect of the micellar action of a variety of surfactant-active ionic liquids (i.e. SAILs) and conventional surfactants on the apparent solubility of HCH and its bioavailability was studied. Solutions of SAILs/surfactants and HCH (at a concentration ca. 10 times its solubility limit) were prepared using two different concentrations of SAILs/surfactants (always >CMC). The results varied according to the HCH isomer, the SAIL/surfactant and the concentration used. Additionally, the ecotoxicity of SAILs/surfactants was studied in two plant species. This study demonstrates the potential of SAILs and surfactants for their application in bioremediation of HCH-contaminated soils and proposes several SAILs for future research.
The low bioavailability of hexachlorocyclohexane (HCH) affects the effectiveness of bioremediation processes of HCH-contaminated soils. The effect of the micellar action of a variety of surfactant-active ionic liquids (i.e. SAILs) and conventional surfactants on the apparent solubility of HCH and its bioavailability was studied. Solutions of SAILs/surfactants and HCH (at a concentration ca. 10 times its solubility limit) were prepared using two different concentrations of SAILs/surfactants (always >CMC). The results varied according to the HCH isomer, the SAIL/surfactant and the concentration used. Additionally, the ecotoxicity of SAILs/surfactants was studied in two plant species. This study demonstrates the potential of SAILs and surfactants for their application in bioremediation of HCH-contaminated soils and proposes several SAILs for future research.
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Traballo Fin de Máster en Enxeñaría Ambiental. Curso 2019-2020
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