Title: Surfactant Solubilization of Hydrophobic Compounds in Soil and Water. II. The Role of Dodecylsulphate-Soil Interactions for Hexachlorobenzene.
Authors: SKEJO-ANDRESEN Helle bro
Citation: Environmental Science and Pollution Research International vol. 3 no. 4 p. 183-188
Publication Year: 1997
JRC N°: JRC12778
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC12778
Type: Articles in periodicals and books
Abstract: The soil/water partition coefficient (Kd) of hexachlorobenzene (HCB) ranged from 220 l/kg to 1800 l/kg for eight soils having a wide range of phsyco-chemical properties. Kd normalized to soil's organic carbon (Koc) was found to be 28000plus/minus4800 l/kg. The effect on the apparent soil/water partition coefficient (Kd*) caused by the anionic surfactant dodecylsulphate (DS) was studied. DS present at concentrations above the critical micellar concentration (CMC) caused reductions in Kd* in the range of 3-26 times for most soils and even up 36-91 times for sandy soils. Below CMC, at environmentally relevant surfactant concentrations, Kd* was reduced by a factor of 1-13. For clay and calcareous soils significant adsorption/complexation/precipitanttion of DS occured. At the lowest DS concentration this produced a two-fold increase in Kd*. At increasing Ds concentrations this effect was shielded by the solubilizing effect from DS. Monomer (Kmn) surfactant/water partition coefficients for HCB were determined to be, 980plus/minus190 l/kg and 21000plus/minus1600 l/kg, respectively.
JRC Directorate:Joint Research Centre Historical Collection

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