Study of an Amphoteric Surfactant in a Soil Decontamination Process Using ANS Enhanced Fluorescence: Micellar Behavior and Dosing in Synthetic and Soil Solutions |
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| Authors: | Pascal Castellazzi Guy Mercier Jean-François Blais |
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| Institution: | 1. Institut National de la Recherche Scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, QC, Canada, G1K 9A9
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| Abstract: | Cocamidopropyl hydroxysultaine (CAS) has been used in a pilot plant study as a biodegradable surfactant for the extraction
of polycyclic aromatic hydrocarbons (PAHs) and lead (Pb) from contaminated soils. The soil treatment has been done in flotation
cells with a concentration of 0.20 g CAS L−1 in saline conditions (3 M NaCl) and using a pulp density of 20% (w/w). The process integrates the recirculation of the liquid phases separated from the soil by centrifugation or filtration.
Thus, it was necessary to understand CAS-PAHs micellar behavior and to follow the behavior and the fate of the surfactant
in the process. 1-8-anilino-naphthalene sulfonate (ANS) is used as a fluorophor compound in the ANS enhanced fluorescence
technique. A three-dimensional model detailing the change in the micellar behavior at high NaCl concentration and at different
pH has been established. Fluorescence results of centrifuged soil matrix containing CAS have been compared to the results
from synthetic solutions assays. A method allowing an accurate titration of the CAS has been developed by using the exact
same matrix of the soil as the tested samples for the preparation of the calibration curves. The study of the surfactant concentration
in the process has been performed and allows the adjustment of the CAS concentration in the recirculated water. |
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