The effect of organic acids on the behaviour and biodegradation of 14C-phenanthrene in contaminated soil
| Autor: | Gabriela M. Vázquez-Cuevas, Carly J. Stevens, Alfonso Jose Lag-Brotons, Kirk T. Semple, Jose J. Ortega-Calvo |
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| Přispěvatelé: | Consejo Nacional de Ciencia y Tecnología (Paraguay), Lancaster University, Ortega Calvo, J. J. [0000-0003-1672-5199], Semple, Kirk T. [0000-0002-4046-2037], Ortega Calvo, J. J., Semple, Kirk T. |
| Rok vydání: | 2020 |
| Předmět: |
Pollutant
Rhizosphere Bioavailability fungi Soil Science 04 agricultural and veterinary sciences Biodegradation Phenanthrene Root exudates Microbiology Soil contamination chemistry.chemical_compound Ageing chemistry Environmental chemistry Desorption Organic acids 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Malic acid |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 8 páginas.- 5 tablas.- 58 referencias.- Supplementary data to this article can be found online at https://doi.org/10.1016/j.soilbio.2020.107722 The interaction between root exudates and soil microbes has been hypothesised as the primary mechanism for the biodegradation of organic pollutants in the rhizosphere. However, the mechanisms governing this loss process are not completely understood. This study aimed to investigate the effect of two important compounds within root exudates (citric and malic acid) on 14C-phenanthrene desorption and bioaccessibility in soil. Overall results showed that the presence of both citric and malic acid (>100 mmol l−1) enhanced the desorption of 14C-phenanthrene; this appeared to be concentration dependant. Increases in extractability were not reflected in a higher bioaccessibility. Despite enhancing the desorption of 14C-phenanthrene in soil, there is no direct evidence indicating that citric or malic acid have the ability to promote the biodegradation of 14C-phenanthrene from soil. Results from this study provide a novel understanding of the role that substrates, typically found within the rhizosphere due to root exudation, play in the bioaccessibility and biodegradation of hydrocarbons in contaminated soil. GVC would like to thank the Mexican National Council for Science and Technology (CONACyT) for their financial support through a scholarship (No. 313807 ) to pursue postgraduate studies at the Lancaster Environment Centre, Lancaster University. |
| Databáze: | OpenAIRE |
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