Assessing PAH movement Implications for exposures, remediation and - - PowerPoint PPT Presentation

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Assessing PAH movement Implications for exposures, remediation and - - PowerPoint PPT Presentation

Mar 29, 2023 383 likes •495 views

Assessing PAH movement Implications for exposures, remediation and interventions October 29, 2020 Christine Ghetu 1 , Jamie D. Minick 1 , Lane G. Tidwell 1 , Peter D. Hoffman 1 , Kim A. Anderson 1 1 Oregon State University, Corvallis, OR, USA

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SLIDE 1

Assessing PAH movement

Implications for exposures, remediation and interventions

Christine Ghetu1, Jamie D. Minick1, Lane G. Tidwell1, Peter D. Hoffman1, Kim A. Anderson1

October 29, 2020

1Oregon State University, Corvallis, OR, USA

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PAH MOVEMENT AFFECTS ASSESSMENT OF: Exposures, Remediation and Interventions

  • 1. Bioavailable PAHs in the environment

are moving constantly.

  • 2. Will PAHs move differently depending
  • n season?
  • 3. Are PAHs moving by both diffusion and

advection processes?

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  • Each sampling location had diffusive flux units and

advective flux units co-deployed

  • Passive samplers were deployed for 30 days in August,

September and October 2019

  • ~ 150 PSDs total
  • A 24-hour seepage meter reading was taken at each site

in August, September and October 2019

  • ~ 35 readings total

FIELD STUDY DESIGN

N

Average Summer Advection Average Fall Advection

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GENERAL NAMING SCHEME

upstream cove peninsula shore pilings

N

PSDs water, soil diffusion and advection Air, water PSDs

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AIR, WATER AND POREWATER PAH CONCENTRATIONS CHANGE TEMPORALLY

HOW DOES THIS AFFECT CHEMICAL MOVEMENT?

  • Air increased on average 35% from summer to fall
  • Water decreased on average 25% from summer to fall
  • Sediment porewater increased on average 36% from

summer to fall

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SLIDE 6

ADVECTIVE PAH FLUX: SUMMER AND FALL

(note scale break)

  • MOST sites PAHs are moving

from the sediments to river

  • LESS advective flux in fall

compared with summer

  • BIG difference in advective

flux between sites

6

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DIFFUSIVE PAH FLUX: SUMMER AND FALL

  • BIG difference in diffusive flux of

PAHs between sites

  • MOST sites diffusing PAHs from

sediments to water

  • LESS diffusion in fall
  • SMALL, but MORE change in

diffusion btw summer and fall

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DIFFUSIVE AND ADVECTIVE FLUX MAGNITUDE SUMMER AND FALL

 DIFFUSIVE flux is the LARGEST contribution

  • f chemical movement in summer and fall

1-methylnaphthalene fluoranthene benzo[c]fluorene 1-methylnaphthalene fluoranthene benzo[c]fluorene

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SLIDE 9

Thank you

9

ACKNOWLEDGEMENTS

Thank you to the Port of Columbia County and Cascadia Associates, LLC for access to the site! Food Safety & Environmental Stewardship Laboratory

  • Kim Anderson
  • Peter Hoffman
  • Richard Scott
  • Lane Tidwell
  • Brian Smith
  • Michael Barton
  • Steven O’Connell
  • Jamie Minick
  • Holly Dixon
  • Carolyn Poutasse
  • Kyle Messier
  • Clarisa Caballero-Ignacio

Achievement Rewards for College Scientists (ARCS) Foundation National Institute of Environmental Health Sciences (NIEHS) P42 ES016465

  • Brianna Rivera
  • Ian Moran
  • Sam Samon
  • Jacob Del Savio
  • Ty Byrd
  • Kaci Graber
  • Caoilinn Haggerty
  • Jessica Scotten
  • Teresa Valdez
  • Jacob Armstrong
  • Kaley Adams
  • Emily Bonner
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SLIDE 10

Flux ng/m2d

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AIR-WATER DIFFUSIVE PAH FLUX

TEMPORAL CHANGE OF PAH MAGNITUDE

2 and 3 ring PAHs:

  • Most sites are volatizing PAHs in

summer

  • About 21% of compounds are in

deposition

  • Most sites are in deposition in fall
  • Suggests there are new atmospheric

inputs into the system 4 ring through 5 ring PAHs:

  • Most sites are in volatilization
  • In both summer and fall, the magnitude of

deposition is greater than the magnitude of volatilization

acenaphthene benzo[c]fluorene