A new micelle-based method to quantify the Tween 80® surfactant for soil remediation
- 556 Downloads
Tween 80® is a surfactant widely employed to enhance remediation of contaminated soils. Actually, there are few convenient and selective methods to quantify Tween 80® at low concentrations. Here, we report a new and simple quantification method to monitor Tween 80® analysis. Our method is based on the enhancement of the fluorescence of 6-(p-toluidino)naphthalene-2-sulfonic acid (TNS) by formation of micelles with Tween 80®. Results show a linear calibration curve with a correlation coefficient R 2 of 0.99, a detection limit of 0.13 mM and a quantification limit of 0.19 mM. This method showed better performances compared to actual methods such as UV absorbance and total organic carbon measurements. In addition, we demonstrated that the measurements using this new technique are impacted only at 3.5 % maximum by the presence of oxidation by-products formed during oxidation of Tween 80® by the electro-Fenton process or by hydrophobic organic contaminants present in solution. Fluorescence measurements of soil washing solution with real contaminated soil show almost no impact on Tween 80®–TNS micelle analysis. The analytical method proposed for Tween 80® analysis could replace the currently used conventional method because it is quite simple, highly sensitive and more selective.
KeywordsMicelle Fluorescence quantification Soil organic matter Hydrophobic organic contaminants By-products Electro-Fenton
The authors would like to thank the European Commission for providing financial support through the Erasmus Mundus Joint Doctorate Programme ETeCoS3 (Environmental Technologies for Contaminated Solids, Soils and Sediments) under the grant agreement FPA no 2010-0009. Emmanuel Mousset is a Doctoral Research Fellow of the ETeCoS3 programme.
- Gomez J, Alcantara MT, Pazos M, Sanroman MA (2010) Remediation of polluted soil by a two-stage treatment system: desorption of phenanthrene in soil and electrochemical treatment to recover the extraction agent. J Hazard Mater 173:794–798. doi: 10.1016/j.jhazmat.2009.08.103 PubMedCrossRefGoogle Scholar
- Rouessac F, Rouessac A, Cruché D (2004) Analyse chimique—Méthodes et techniques instrumentales modernes. Dunod, ParisGoogle Scholar