1 / 16

Partitioning Coefficients of BTEX Compounds Between NLF Leachate and Water

Partitioning Coefficients of BTEX Compounds Between NLF Leachate and Water. Jeremy T. Roop Dr. Mark A. Nanny Crystal K. Stearns. Overview. Background Goal Experimental Designs Results/future research. Background. Norman landfill Older landfill Inadequate liner

nydia
Download Presentation

Partitioning Coefficients of BTEX Compounds Between NLF Leachate and Water

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related