Mechanisms of enhanced mobilisation of trace metals by anionic surfactants in soil

Hernandez-Soriano, Maria del Carmen, Degryse, Fien and Smolders, Erik (2011) Mechanisms of enhanced mobilisation of trace metals by anionic surfactants in soil. Environmental Pollution, 159 3: 809-816. doi:10.1016/j.envpol.2010.11.009

Author Hernandez-Soriano, Maria del Carmen
Degryse, Fien
Smolders, Erik
Title Mechanisms of enhanced mobilisation of trace metals by anionic surfactants in soil
Journal name Environmental Pollution   Check publisher's open access policy
ISSN 0269-7491
Publication date 2011-03-01
Sub-type Article (original research)
DOI 10.1016/j.envpol.2010.11.009
Open Access Status Not yet assessed
Volume 159
Issue 3
Start page 809
End page 816
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
Long-term applications of small concentrations of surfactants in soil via wastewater irrigation or pesticide application may enhance trace metal solubility. Mechanisms by which anionic surfactants (Aerosol 22, SDS and Biopower) affect trace metal solubility were assessed using batch, incubation and column experiments. In batch experiments on seven soils, the concentrations of Cu, Cd, Ni and Zn in the dissolved fraction of soils increased up to 100-fold at the high application rates, but increased less than 1.5-fold below the critical micelle concentration. Dissolved metal concentrations were less than 20% affected by surfactants in long-term incubations (70 days) up to the largest dose of 200 mg C kg−1 soil. Leaching soil columns with A22 (100–1000 mg C L−1) under unsaturated conditions increased trace metal concentrations in the leachates 2–4 fold over the control. Correlation analysis and speciation modelling showed that the increased solubility of metals upon surfactant application was more related to the solubilisation of soil organic matter from soil than to complexation of the metals with the surfactant. Organic matter from soil was solubilised in response to a decrease of solution Ca2+ as a result of Ca–surfactant precipitation. At environmentally relevant concentrations, surfactant application is unlikely to have a significant effect on trace metal mobility.
Keyword Anionic surfactants
Dissolved organic carbon (DOC)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Created: Mon, 06 Jan 2014, 14:24:59 EST by Maria Hernandez-soriano on behalf of School of Agriculture and Food Sciences