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Funded through Florida International University

Funded through Florida International University National Institute for Environmental Health Sciences. Impacts from CCA-Treated Wood Within Marine and Terrestrial Environments. Specific Aims.

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Funded through Florida International University

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  1. Funded through Florida International University National Institute for Environmental Health Sciences Impacts from CCA-Treated Wood Within Marine and Terrestrial Environments

  2. Specific Aims • Evaluate the impacts of arsenic from CCA-treated wood by measuring the species of arsenic that are leached from different environmental samples. • Develop methods for arsenic speciation in the particulate phase.

  3. Research Design and Methods • Laboratory Evaluation (Phase I) • Method Development (Myron) • Leaching Experiments/Soil Column (Bernine) • Data Evaluation • Field Evaluation (Phase II) • Deck Sampling (Bernine) • Marine Dock Sampling (Yong) • Data Evaluation

  4. CCA-Treated Deck Study Bernine Khan University of Miami

  5. CCA-Treated Deck Study • Two 6-ft x 6-ft wood deck • 0.4 pcf CCA treated & untreated (control) 6 ft 6 ft

  6. Deck Study • Panels open for soil sampling (arsenic study currently being conducted by FIU-Chemistry (NIEHS) hinge

  7. Aluminum Base 8 ft Decks placed in resin-coated untreated wooden box (8-ft x 8 ft) mounted on aluminum base 8 ft 5° plexiglass

  8. Resin-coated untreated wooden box • Interior lined with plexiglass • Set in open environment - rainfall

  9. Cross-Section of Layers plexiglass resin-coated box impervious liner perforated drainfield pipe 6” PVC pipe sand

  10. Leachate Collection Systems rainwater runoff percolating rainwater

  11. Percolating Rainwater Collection System 2-way valve

  12. Leachate Collection Systems • Analyze for arsenic species • Rainwater runoff data – estimate how much arsenic & rate of leaching from deck to soil • Percolating rainwater – arsenic migration rate through soil

  13. Total As(V) As(III) Arsenic Concentration (mg/L) CCA-Treated vs Untreated Deck Untreated <0.01 mg/L

  14. Results After From Nine Rain Events (Sept 16th – Nov. 25th) • Total Rainfall – 16 inches • Untreated Deck • - Rainwater Runoff - <0.01 mg/L • Rainwater Infiltration - < 0.01 mg/L • CCA-Treated Deck • - Rainwater Runoff - ~ 1.25 mg/L • Rainwater Infiltration - < 0.01 mg/L

  15. Cumulative Arsenic (mg) Rainwater Runoff From CCA-Treated Deck Total 6 ft 6 ft As(V) As(III)

  16. Sand As(V) Organic As(III) Future Soil Column Experiment Organic As(V) Sand As(III) As(III) As(V) Peristaltic Pump O As(V) O As(V) S As(V) O As(III) O As(III) S As(III)

  17. Column Cross-section PVC Pipe Coat of Sand 8 in Soil Measure As Conc. with time Felt liner 4in

  18. ? ? ? Questions

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