Funded through Florida International University

National Institute for Environmental Health Sciences

Impacts from CCA-Treated Wood Within Marine and Terrestrial Environments

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.

• 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

Research Design and Methods

CCA-Treated Deck Study

Bernine KhanUniversity of Miami

•Two 6-ft x 6-ft wood deck

•0.4 pcf CCA treated & untreated (control)

6 ft6 ft

CCA-Treated Deck Study

Deck Study

•Panels open for soil sampling (arsenic study currently being conducted by FIU-Chemistry (NIEHS)

hinge

Aluminum Base

Decks placed in resin-coated untreated wooden box (8-ft x 8 ft) mounted on aluminum base

5°

8 ft

plexiglass

8 ft

Resin-coated untreated wooden box

• Interior lined with plexiglass•Set in open environment - rainfall

Cross-Section of Layers

impervious liner

6” PVC pipe

perforated drainfield pipe

plexiglassresin-coated box

sand

Leachate Collection Systems

percolating rainwater

rainwater runoff

Percolating Rainwater Collection System

2-way valve

•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

Leachate Collection Systems

Arsenic Concentration (mg/L)

CCA-Treated vs Untreated Deck

0

0.5

1

1.5

2

2.5

3

S 16 S 19 S 23 S 24 S 25 S 29 O 5 N 21 N 25

Con

cent

ratio

n (m

g/L) As(III)

As(V)

Total

Untreated<0.01 mg/L

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

0

100

200

300

400

500

600

S 16 S 19 S 23 S 24 S 25 S 29 O 5 N 21 N 25

Wei

ght (

mg)

As(III)

As(V)

Total

Cumulative Arsenic (mg)Rainwater Runoff From

CCA-Treated Deck

6 ft6 ft

Future Soil Column Experiment

As(V)As(III)

OAs(V)

OAs(III)

SAs(V)

SAs(III)

OAs(V)

OAs(III)

Peristaltic Pump

SandAs(III)

SandAs(V)

OrganicAs(III)

OrganicAs(V)

Soil

Felt liner

PVC Pipe

Column Cross-section

Coatof Sand

8 in

4in

Measure As Conc. with time

??Questions?