TABLE 4-5 Comparison of Predicted and Measured PCDDs for Southern Ontario

Medium

T4CDDg

H6CDDg

O8CDDg

Air (ng/m3)

 

Estimated

2 × 10-5

2.2 × 10-5

3.8 × 10-5

Reporteda

1 × 10-5

6 × 10-4

5 × 10-4

Water (ng/l)

 

Estimated

5.7 × 10-6

2.7 × 10-4

3.8 × 10-4

Soil (mg/kg)

 

Estimated

4.8 × 10-8

1.6 × 10-7

7.9 × 10-7

Reporteda ,b

(<1-9) × 10-3

1.7 × 10-4

3.5 × 10-3

Sediment (mg/kg)

 

Estimated

1 × 10-6

8.7 × 10-7

1.4 × 10-5

Reportedd

2.6 × 10-5

1 × 10-5

5.6 × 10-4

Vegetation (mg/kg)

 

Estimated

4.8 × 10-8

1.6 × 10-7

7.9 × 10-7

Reportedb ,e

4 × 10-7

<1 × 10-8

<1 × 10-6

Reportedf

<2 × 10-8

<3 × 10-7

1 × 10-6

Meat (mg/kg)

 

Estimated

2,2 × 10-8

7.4 × 10-8

3.5 × 10-7

Reportedb ,e

<1 × 10-6

<1 × 10-6

1 × 10-6

Reportedf

<2 × 10-6

<1 × 10-6

(3-24) × 10-6

Dairy (mg/kg)

 

Estimated

7.7 × 10-9

2.6 × 10-8

1.3 × 10-7

Reportede

2.5 × 10-6

<1 × 10-6

3.6 × 10-5

Reportedf

<1 × 10-7

<1 × 10-7

1 × 10-6

Fish (mg/kg)

 

Estimated

2.3 × 10-6

1.3 × 10-5

1.8 × 10-5

Reportedb

<1 × 10-6

   

Human Adipose Tissue (mg/kg)

 

Estimated

4.8 × 10-5

5.3 × 10-5

3.9 × 10-5

Reportedc

5 × 10-6

7.2 × 10-5

5.6 × 10-4

a Cantox Inc “Health Hazard Evaluation of Seicfic PCDDS, PCDFS, and PAH in Emissions from the Proposed Petrous/S.C. Resource Recovery Incineration and From Ambient Background Sources”, Petrous/S.C. Operations Ltd., Oakville, Ontario (February, 1988)

b Travis, C. C., and H. A. Hattemer-Frey, “Human Exposure to 2,3,7,8-TCDD”, Chemosphere, 16:2331-2342 (1987)

c Stanley, J. S., Boggess, K. E., Onstot, J., Sack, T. M., Remmers, J. C., Breen, J., Kutz, F. W., Carra, J., Robinson, P., and Mack, G. A., “PCDDs and PCDFs in Human Adipose Tissue from the EPA FY82 NHATS Repository”, Chemosphere, 15:1605-1612 (1986)

d Astle, J. W., Gobas, F. A. P. C., Shiu, W. J., and Mackay, D., “Lake Sedimentation in Historic Records of Atmospheric Contaminants by Organic Chemicals”, pp. 57-77 in Sources and Fates of Aquatic Pollutants, R. A. Hites and S. J. Eisenreich, Eds., American Chemical Society, Washington, D. C., 1987.

e Davies, K. “Concentration and Dietary Intake of Selected Organochlorines, including PCBs, PCDDs, PCDFs in Fresh Food Composites Grown in Ontario, Canada ”, Chemosphere, 17:263-276 (1989)

f Ontario Ministry of Agriculture and Food, Ontario Ministry of the Environment, Toxics in Food Steering Committee. Polychlorinated Dibenoz-p-dioxins and Polychlorinated Dibenzofurans and other Organochlorine Contaminants in Food, Toronto. (1988).

g “T4CDD” refers to tetra-chlorinated dioxin, “H6CDD” refers to hexa-chlorinated dioxin, and “O8CDD” refers to octa-chlorinated dioxin.

Source: Paterson et al. 1990. Reprinted with permission from Emissions from Combustion Processes: Origin, Measurement, Control;copyright 1990, CRC Press, Boca Raton, Fla.



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