Esgp exit talk

13
ESGP Masters Exit Presentation Maureen Langlois March 4, 2011

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Transcript of Esgp exit talk

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ESGP Masters Exit Presentation

Maureen LangloisMarch 4, 2011

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Background

HydrolysisAdsorption

Volatilization

Photolysis

Biodegradation

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Organic compounds can degrade in sunlight

Direct Photolysis

Indirect Photolysis

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Experimental Approach

Filter (1 µm)

Store at 4°C

4 wetlands:

OhioHawaiiFloridaGeorgia

Herbicide: Acetochlor or Isoproturon

HPLC

Solar Simulator

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Who uses these herbicides, anyway?

Acetochlor Isoproturon

• Broadleaf herbicide • Corn/soy• #2 in the U.S.1

• Detected in surface2, ground3, rain4 waters. • Suspected carcinogen

• Broadleaf herbicide • Spring/winter wheat, barley• Detected in surface waters5 • Suspected carcinogen

Chloroacetanilide Phenylurea

1Vecchia et al. ES&T, 2009 2Kolpin et al. ES&T, 1996 3Newcombe et al. JEQ, 2005 4Vogel et al. JEQ, 2008 5Singer et al. Env. Poll. 2010

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Chief Findings

1. Different wetlands cause different photoreactivity

2. The two herbicides react differently in the same water

3. Water chemistry drives reactivity

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1. Different wetlands cause different photoreactivity

Distilled water

Yocom Wetland,

Ohio

Okeefenokee Swamp, Georgia

Kawainui Wetland, Hawaii

Everglades, Florida

Half-life, days

Acetochlor

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We even see a difference over small time periods in the same wetland…

Yocom Wetland,

Ohio

Half-life, days

Acetochlor

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2. The two herbicides react differently in the same water

Yocom Wetland,

Ohio

Okeefenokee Swamp, Georgia

Kawainui Wetland, Hawaii

Everglades, Florida

Half-life, days

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3. Wetland chemistry drives reactivity

Yocom Wetland,

Ohio

Acetochlor

Total Nitrogen, μM

NO3/NO2, μM

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Different compounds degrade via different mechanisms

Acetochlor and

Isoproturon

Just Isoproturon

3

Gerecke et al. 2001, ES&T

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Environmental Significance

•Wetlands can be valuable (photo)reactors

•Buffer systems can be designed with the chemistry in mind

•Fewer herbicides in use mean fewer to degrade!

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Acknowledgements

Advisers

Prof. Yo ChinProf. Linda Weavers

Collaborators

Prof. John LenhartProf. Larry BrownChin Research GroupOSU Environmental Engineering Research Group

Funding

National Science Foundation Graduate STEM Fellows in K-12 Education Program

Ohio Water Development Authority Research and Development Grant

OSU Environmental Science Graduate Program


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