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Quantifying BTEX Partitioning Coefficients in NLF Leachate

Explore the partitioning coefficients of BTEX compounds in landfill leachate to water, using SPME technique. Results show the interaction of organic matter and BTEX compounds, allowing prediction of chemical fate in the environment.

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Quantifying BTEX Partitioning Coefficients in NLF Leachate

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  1. Partitioning Coefficients of BTEX Compounds Between NLF Leachate and Water Jeremy T. Roop Dr. Mark A. Nanny Crystal K. Stearns

  2. Overview • Background • Goal • Experimental Designs • Results/future research

  3. Background • Norman landfill • Older landfill • Inadequate liner • Development of leachate plume • BTEX • Benzene, Toluene, Ethylbenzene and Xylene • Hydrophobic, Toxic and Soluble

  4. Background (cont.) • BTEX compounds • Paints, solvents and gas • Present in NLF and other older municipal landfills

  5. Goal: To quantify the partitioning coefficients of BTEX compounds between organic matter present in NLF leachate and water

  6. How does organic matter in leachate interact with BTEX compounds? • BTEX partitions to organic matter • Def. Partitioning • Why is it important to quantify partitioning coefficients? • Shows partitioning to organic matter vs. partitioning to water • Allows prediction of chemical fate in environment

  7. Solid Phase Microextraction • Technique used to measure free concentrations in solution • How it works • Analytes in solution partition to wick and equilibrium is reached • Once at equilibrium, amount on wick is constant • Wick can be exposed to GC for desorption

  8. Benefits of SPME • Time saving • Accurate • Doesn’t involve solvents • Relatively inexpensive

  9. Experimental Design • Goal: Quantify partitioning coefficients • Concept • Prepare solutions with various different leachate/toluene ratios • Determine amount of toluene partitioning by measuring free concentrations • Plot data • Free concentration vs. toluene/leachate ratio • Take slope of best fit line

  10. Preliminary Results • Good data

  11. Effects of Saturation • Runs with leachate • Saturated salt solutions effect sensitivity of SPME method • Increased conductivity of leachate was increasing sensitivity of method

  12. Experimental Design II • Added NaCl to adjust conductivity of control samples • Preliminary data was good

  13. More complications • Not reproducible • Increasing saturation of solution may effect kinetics of wick

  14. Results and Conclusions • SPME is a good technique • Capable of accuracy • Lots of variables • Saturated salt solutions greatly effect sensitivity and accuracy of SPME

  15. Future Research • Explore effects of conductivity on SPME technique • Fulvic acid experiment • Plenty of time • Automation-eliminate error and save time • Newer equipment, capable of greater degree of consistency

  16. Acknowledgements • Dr. Mark A. Nanny and Crystal K. Stearns • Dr. Kolar, Lisa Hare, Erin Breetzke and OU REU • NSF EEC-9912319

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