Potential Application of Surface-Active Ionic Liquids and Surfactants in the Remediation of HCH - Contaminated Soils Through Solubility Enhancement
| العنوان: | Potential Application of Surface-Active Ionic Liquids and Surfactants in the Remediation of HCH - Contaminated Soils Through Solubility Enhancement |
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| المؤلفون: | Chaos-Carballo, Z., Balseiro-Romero, M., Calviño-Vázquez, B., Soto Campos, Ana M., Monterroso, C. |
| المصدر: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| بيانات النشر: | SETAC (Society), 2021. |
| سنة النشر: | 2021 |
| الوصف: | Poster presentado en the SETAC Europe 31st Annual Meeting from 2–6 May 2021 in Seville, Spain. Hexachlorocyclohexane (HCH) has been one of the most used pesticide from 1950 to early 2000 and has led to a current global soil pollution. HCH isomers are considered persistent organic pollutants (Stockholm Convention, 2009) and restoration of HCH-contaminated soils is urgently required. Bioremediation is one of the most promising remediation techniques and its effectiveness can be enhanced through the application of surfactants, which solubilize the contaminant, and hence increase its bioavailability. However, their application in situ is challenging due to their reported toxicity. In this context, we evaluated the micellar effect of a wide structurally diverse group of Surface- Active Ionic Liquids (SAILs) and conventional surfactants (non-ionic, cationic and anionic) on the modification of the apparent solubility of HCH in water. The synergistic effect of a combined system of a SAIL and a surfactant was verified using two blends with different SAIL/surfactant proportions. SAILs/surfactant solutions of different concentrations (>critical micelle concentration) were contaminated with HCH isomers (at a concentration ca. 10 times their solubility limit) and left under constant agitation until equilibrium (24 h). Then, the solubilized fraction of HCH isomers was analysed by GC/MS, and the solubility enhancement caused by SAILs/surfactants was calculated by normalization with a SAIL/surfactant-free control. Additionally, two ecotoxicological assessments were carried out: a) germination and early growth of Lolium perenne and Trifolium pratense; and b) inhibition of bacterial bioluminescence of Aliivibrio fischeri. HCH solubility enhancement varied depending on the concentration and the structure of SAILs/surfactants, inducing also different effects among individual isomers. In general, anionic compounds showed a higher effect on the solubilisation of HCH, reaching up to a ca. 7-fold increase with regard to the control. However, most of them were toxic to plants and/or bacteria. Non-ionic compounds were less toxic and performed better at lower concentrations, what may be an advantage for in situ bioremediation procedures. Moreover, the use of blends demonstrated an improvement over individuals. This study evidences the potential of SAILs and surfactants for their application in the remediation of HCHcontaminated soils, particularly, for bioavailability enhancement, and set the basis for their application in further research with contaminated soil samples. |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::738d183b9db06c8826ac645d5acca020 http://hdl.handle.net/10261/251935 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.dedup.wf.001..738d183b9db06c8826ac645d5acca020 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |