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Quantities of As in Florida

Quantities of As in Florida. Purpose. Determine the relative magnitude of arsenic from CCA-treated wood versus the amounts from other arsenic sources Evaluate arsenic inputs, outputs, and reservoirs. Inputs/Outputs/Reservoirs. CCA-treated Wood Non-CCA Pesticides Geologic Sources Fuels

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Quantities of As in Florida

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  1. Quantities of As in Florida

  2. Purpose • Determine the relative magnitude of arsenic from CCA-treated wood versus the amounts from other arsenic sources • Evaluate arsenic inputs, outputs, and reservoirs

  3. Inputs/Outputs/Reservoirs • CCA-treated Wood • Non-CCA Pesticides • Geologic Sources • Fuels • Fertilizers • Food Sources • Wastes Disposed Within State • Hydrosphere

  4. Methods

  5. AWPA,AWPI,SFPA~0.38 pcf (US) Florida Questionairre~0.76 pcf Methods: CCA Input: 31.2 million ft3/yr Extrapolated from Industry Statistics Average retention of 0.45 pcf (22% arsenic) (million ft3/yr)(retention) = 1,400 metric tons As/yr

  6. Methods: non-CCA Pesticides • Cattle Dipping Vats (Historical Use) • MSMA/DSMA/Cacodylic Acid (Current Use) • Agriculture • Golf Course Use

  7. MSMA/DSMA in Agriculture From the Nat. Center for Food and Ag. Policy, 2002

  8. MSMA Use in Golf Courses Input = (Surface Area of Golf Courses) (Fraction of Golf Courses that Use MSMA) (Application Rate) Surface Area = Total Area from Florida Golf Courses Fraction of Golf Courses that Use MSMA = 0.96 (Ma et al. 2000) Application Rate = 11.7 lbs/acre/yr (from Hawaiian Study) Input ~ 500 metric tons As/yr

  9. MSMA Stored in Golf Courses • DERM 1999: 16.9 mg/kg (0 to 1 or 2 ft composites) • Ma et al. 2000: 69.2 mg/kg Mass = (Surface Area of Golf Courses) x (Concentration)

  10. Results

  11. Inputs

  12. Outputs Input Flux ~ 2,500 metric tons As/yr Output Flux ~ 10% of Input

  13. Accessible Reservoir

  14. Summary/Conclusions • Approx. 2,500 metric tons As imported per yr • CCA-treated wood (60%) • Arsenical pesticides,MSMA (20%) • Geologic Sources (15%) • About 10% of the imported As is exported  Majority accumulates over time

  15. Recommendations • In order to limit As impacts • Reduce use of MSMA • Properly dispose CCA-treated wood • Minimize impacts of CCA-treated wood currently in service

  16. Questions?Draft Report posted atwww.ccaresearch.org

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