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Related Experiment Videos

Humic acid complexation of basic and neutral polycyclic aromatic compounds.

K G Karthikeyan1, Jon Chorover

  • 1Department of Biological Systems Engineering, The University of Wisconsin, Madison 53706, USA. kkarthikeyan@facstaff.wisc.edu

Chemosphere
|September 12, 2002
PubMed
Summary

Humic acid (HA) complexation differs for basic quinoline and neutral naphthalene. Quinoline sorption is pH-dependent due to ionization, while naphthalene binding is unaffected by solution conditions.

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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Analytical Chemistry

Background:

  • Polycyclic Aromatic Compounds (PACs) are environmental contaminants.
  • Humic acid (HA) is a major soil organic matter component influencing contaminant fate.
  • Understanding PACs-HA interactions is crucial for environmental risk assessment.

Purpose of the Study:

  • Compare complexation of basic quinoline and neutral naphthalene with HA.
  • Investigate the influence of solution chemistry on PACs-HA interactions.
  • Evaluate fluorescence spectroscopy and equilibrium dialysis (ED) for quantifying PACs sorption.

Main Methods:

  • Fluorescence spectroscopy to monitor quinoline complexation.
  • Equilibrium dialysis (ED) for independent sorption measurements.

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  • Varying pH and electrolyte cation (Li+) concentrations to assess chemical influences.

    • Main Results:

    • Quinoline sorption to HA is pH-dependent, peaking near its pKa, and competes with H+ and Li+.
    • Fluorescence quenching indicates static complex formation between quinolinium ions and HA.
    • Naphthalene-HA interactions are insensitive to pH and ionic strength.
    • Fluorescence data suggested higher complexation extent than ED measurements.

    Conclusions:

    • Ionization state critically controls basic PAC sorption to HA via cation exchange.
    • Hydrophobic interactions govern neutral PAC sorption to HA, independent of solution chemistry.
    • Fluorescence spectroscopy offers a sensitive method for studying PACs-HA complexation, though discrepancies with ED warrant further investigation.