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Extraction of PAHS from an aged creosote-polluted soil by cyclodextrins and rhamnolipids. Side effects on removal and availability of potentially toxic elements

AuthorsMadrid Díaz, Fernando ; Ballesteros, Rubén; Lacorte Bruguera, Silvia ; Villaverde Capellán, J. ; Morillo González, Esmeralda
Soil washing
Toxic elements
Binary alloys
Polycyclic aromatic hydrocarbons
Issue Date25-Feb-2019
CitationScience of the Total Environment 653: 384-39 (2019)
AbstractThis study evaluated the effect of several cyclodextrins (CDs) and a rhamnolipid (RL) on the removal of polycyclic aromatic hydrocarbons (PAHs) from a co-contaminated soil which had received historically creosote and inorganic wood preservatives for almost 100 years, and the effect of such extractions on the potentially toxic elements (PTEs). The influence on such processes of an electrolyte (0.01 M Ca(NO3)2) was also studied. Up to 15.4% of the ∑16 PAHs were extracted using RL in the absence of the electrolyte as washing solution, but decreases until reaching 0.60% in the presence of Ca2+ due to RL precipitation and partial inactivation. Only up to 2% of the ∑16 PAHs was extracted with CDs (4-ring PAHs in higher concentrations), but the electrolyte had no effect on extraction. In relation to PTEs, CDs proved to be inefficient for their extraction, and even RL in the presence of the background electrolyte. But in the absence of electrolyte PTEs extraction by RL increased. Apart from that, the availability of Ni, Cr, and As, those more associated to Fe and Al soil surfaces, increased after extraction with RLs in the presence of Ca2+ (about 100% for Cr and Ni and 200% for As). Under these conditions Fe and Al availability increased two- and ten-fold, respectively, indicating that Fe-Al soil surfaces were altered. Therefore, the ionic strength and the cations present in the soil solution of soils have to be considered when RLs are used as extractants for remediation purposes
Description9 páginas.-- 3 figuras.-- 6 tablas.-- 75 referencias.-- Supplementary data to this article can be found online at https://doi.org/10.1016/j.scitotenv.2018.10.316.
Publisher version (URL)http://dx.doi.org/10.1016/j.scitotenv.2018.10.316
Appears in Collections:(IDAEA) Artículos
(IRNAS) Artículos
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