Appendix D Food Codes for NHANES - OEHHA

SRP Review Draft Version 2 June, 2012
Table G-4 Soil half-lives (days) for PCDD/Fs relevant to the “Hot Spots” program
Compound TEFWHO-97 Half-life (days) from
Kjeller and Rappe (1995)
PCDDs
2378-TCDD 1 37,500
12378-PeCDD 1 42,000
123478-HxCDD 0.1 100,000
123789-HxCDD 0.1 29,200
123678-HxCDD 0.1 23,000
1234678-HpCDD 0.01 37,500
12346789-OCDD 0.0001 54,200
PCDFs
2378-TCDF 0.1 23,000
12378-PeCDF 0.05 18,750
23478-PeCDF 0.5 23,000
123478-HxCDF 0.1 25,000
123789-HxCDF 0.1 20,800
123678-HxCDF 0.1 29,200
234678-HxCDF 0.1 18,750
1234678-HpCDF 0.01 14,600
1234789-HpCDF 0.01 12,500
12346789-OCDF 0.0001 10,400
Arithmetic mean half-lives 30,600
The arithmetic mean of the suggested values from ten studies (6,986 days) cited above
is recommended as the estimated soil half-life of TCDD/Fs if the facility is reporting
emissions of total dioxins and furans.
G-15