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Polycyclic aromatic hydrocarbons

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  • 1. Polycyclic Aromatic Hydrocarbons (PAHs) in Soil Located NearFassnight Creek Meagan NunnShaina Dunn Megan WalcherCarl Hendrix Dan Dougherty December 3, 2012

2. Background of PAHs Definition Groupof organic contaminants that form from the incomplete combustion of hydrocarbons, such as coal and gasoline A compound that is formed from two or more benzene rings 3. Why are PAHs a Concern? Mostof the compounds are highlycarcinogenic at relatively low levels. They are relatively insoluble in water Toxic to aquatic life Several are suspected humancarcinogens Stay in the environment for a long periodof time All vary in behavior 4. Exposure Possibilities for PAHs Breathing air contaminated by coal tar orwild fires Eating foods that have been grilled Transportation (roads and fume exhaust) Smoking tobacco Open trash burning 5. Our Exposure Focus Coal tar sealants are used to seal roadways and parking lots and believed to release PAHs into soil and ultimately waterways. 6. Possible PAHs Nonpolarorganic molecules that comprise two or more benzene rings arranged in various configurations 7. The Goal of Our Study Todetermine if there are any PAHs present in the soil near Fassnight Creek. This is strictly a qualitative study to determine whether or not any are present. 8. Method Collect 100 gram soil samples from 3different locations along Fassnight Creek. Source: National and Bennet Control: Near Art Museum Fort and Linwood Parkview Christian Church Allsamples are about 3 yards from runoff Allow the samples to air dry for 48 hours 9. Method Continued In the lab, remove any debris (leaves,stones, roots, etc) Use a mortar and pestle to grind the soil toa fine powder Store in plastic bottles 10. Method Continued Take about 5g portions of the samples andplace the portions in beakers Add 50mL of a 50-50 mix of acetone+ hexane Cover with watch glass and put on hotplateand simmer for 10-15 minutes Let cool and filter into flasks Add anhydrous sodium sulfate (about 5g) toremove excess water Filter the solution again 11. Method Continued Cook each sample down to about 2 mL 12. Future Studies Quantitative study determine the kinds of PAHs present and the amount present 13. Thank You We would like to send out a special thank you to Dr. Biagioni for helping us with the experiment and providing the lab area to do it. 14. Sources thetruthwins.com (Danger Sign Picture) http://www.medterms.com/script/main/art.asp?articlekey=24287 http://toxics.usgs.gov/definitions/pah.html maine.gov (Cigarette Picture) http://www.epa.gov/wastes/hazard/wastemin/minimize/factshts/pahs.pdf spellboundlabs.co.za (Mortar and PestlePicture)

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