Metal Concentrations in CCA-Treated Wood and Wood Ash
 
Wood Type
Metals Concentration, mg metal per kg of wood or ash
Cr
Cu
As

 
 

Unburned Wooda
 

Untreated Wood 7.0 3.7 2.0
CCA-Treated Wood at 0.25 pcf 2,060 1,230 1,850
CCA-Treated Wood at 0.60 pcf 4,940 2,950 4,435
CCA-Treated Wood at 2.50 pcf 20,600 12,300 18,500
Ashb Non-CCA-Treated Wood 141 212 28
CCA-Treated Wood at 0.25 pcf 20,600 11,200 11,400
CCA-Treated Wood at 0.60 pcf 51,100 32,300 42,800
CCA-Treated Wood at 2.50 pcf 174,000 104,000 113,500

 
 
 

Regulatory 

Limits


 

Federalc

Ceiling (mg/kg) Not 
Applicable
4300 75
Pollution (mg/kg) Not Applicable 1500 41
Floridad Industrial (mg/kg) 430 12,000 3.7
Residential (mg/kg) 290 105 0.8

a Computed values assuming that retention rating equals amount of chemical in wood
b Measured values
c Federal Register 40 CFR Part 503.13, Standards for the Use or Disposal of Sewage Sludge, Subpart B, Land Application
d Florida Department of Environmental Protection, Proposed Chapter 62-777, F.A.C. Contaminant Target Clean-up Levels

Table: Chromium, Copper, and Arsenic Concentrations in Treated Wood and Treated Wood Ash Samples Used in This Study. Regulatory Levels Provided for Comparison.