Surfactant Solubilization of Hydrophobic Compounds in Soil and Water
The soil/water partition coefficient (K(d)) of hexachlorobenzene (HCB) ranged from 220 l/kg to 1800 l/kg for eight soils having a wide range of physicochemical properties. K(d) normalised to soil's organic carbon (K(oc)) was found to be 28000 +/- 4800 l/kg. The effect on the apparent soil/water partition coefficient (K(d)(*)) caused by the presence of the anionic surfactant dodecylsulphate (DS) was studied. DS present at concentrations above the critical micellar concentration (CMC) caused by reductions in K(d)(*) 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, K(d)(*) was reduced by a factor of 1-13. For clay and calcareous soils significant adsorption/complexation/precipitation of DS occurred. At the lowest DS concentration this produced a two-fold increase in K(d)(*). At increasing DS concentrations this effect was shielded by the solubilizing effect from DS. Monomer (K(mn)) and micellar (K(mc)) surfactant/water partition coefficients for HCB were determined to be, 980 +/- 190 l/kg and 21000 +/- 1600 l/kg, respectively.
Bibliographic Reference: Article: Environmental Science and Pollution Research (1996)
Availability: Available from Dr A B Payá-Pérez, Environment Institute, Joint Research Centre, 21020 Ispra (IT)
Record Number: 199610317 / Last updated on: 1996-03-29
Original language: en
Available languages: en