Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13506
Title: The partitioning and modelling of pesticide parathion in a surfactant-assisted soil-washing system
Authors: Chu, W 
Chan, KH
Choy, WK
Keywords: Brij 35
Model
NAPL
Parathion
Sorption
Issue Date: 2006
Publisher: Pergamon Press
Source: Chemosphere, 2006, v. 64, no. 5, p. 711-716 How to cite?
Journal: Chemosphere 
Abstract: Soil sorption of organic pollutants has long been a problematic in the soil washing process because of its durability and low water solubility. This paper discussed the soil washing phenomena over a wide range of parathion concentrations and several soil samples at various fractions of organic content (f oc) levels. When parathion dosage is set below the water solubility, washing performance is stable for surfactant concentrations above critical micelle concentration (cmc) and it is observed that more than 90% of parathion can be washed out when dosage is five times lower than the solubility limit. However, such trends change when non-aqueous phase liquids (NAPL) is present in the system. Parathion extraction depends very much on the surfactant dosage but is not affected by the levels of f oc in the system. In between the extreme parathion dosage, a two-stage pattern is observed in these boundary regions. Washing performance is first increased with additional surfactant, but the increase slows down gradually since the sorption sites are believed to be saturated by the huge amount of surfactant in the system. A mathematical model has included f oc to demonstrate such behavior and this can be used as a prediction for extraction.
URI: http://hdl.handle.net/10397/13506
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2005.11.028
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