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Predicting surfactant modified soil/water distribution coefficients using micellar HPLC

Paterson1, Chowdhry, Leharne

  • 1School of Earth and Environmental Sciences, University of Greenwich, Chatham Maritime, Kent, UK.

Chemosphere
|July 20, 2000
PubMed
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This study shows that ABA block copolymers effectively reduce soil contaminant partitioning. More hydrophobic surfactants are more effective at dispersing contaminants in aqueous solutions for soil remediation.

Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Polymer Science

Background:

  • Soil contamination by hydrophobic organic compounds is a significant environmental issue.
  • Surfactants are explored for their potential in soil remediation by altering contaminant partitioning.
  • ABA block copolymers offer tunable properties for surfactant applications.

Purpose of the Study:

  • To quantify the effectiveness of ABA block copolymers in reducing soil-water distribution coefficients (Kd) for polycyclic aromatic hydrocarbons (PAHs).
  • To investigate the impact of surfactant hydrophobicity on contaminant partitioning.
  • To evaluate micellar High-Performance Liquid Chromatography (HPLC) as a predictive tool for surfactant efficacy in soil remediation.

Main Methods:

  • Measurement of soil-water distribution coefficients (Kd) for naphthalene, phenanthrene, and pyrene using various ABA block copolymers.

Related Experiment Videos

  • Systematic variation of ethylene oxide/propylene oxide ratios in ABA block copolymers to alter hydrophobicity.
  • Micellar HPLC analysis using the same surfactants and hydrophobic solutes.

    • Main Results:

    • Increasing surfactant concentration progressively decreased Kd values, indicating enhanced contaminant dispersion.
    • More hydrophobic ABA block copolymers (lower ethylene oxide/propylene oxide ratio) achieved greater reductions in Kd.
    • A strong log-linear correlation was observed between Kd values and micellar HPLC capacity factors across all tested surfactants.

    Conclusions:

    • ABA block copolymers effectively reduce the partitioning of hydrophobic contaminants from soil to water.
    • Surfactant hydrophobicity is a key factor determining remediation efficiency.
    • Micellar HPLC provides a reliable method for the preliminary assessment of surfactants for contaminated soil remediation.