Table 7.

Mean projected increase in concentration of PCDD/F in food with a given increase in soil or feed concentration.

Food type		Increase in soil or feed PCDD/F concentration (pg TEQ/g dw)a
		1b	5	10	15	30
	n	Projected increase in food concentration (pg TEQ/g dw)
Herbs	5	0.0001 (0.00006)c	0.00 (0.00)d	0.00 (0.00)d	0.00 (0.00)d	0.00 (0.00)d
Potato tuber	9	0.0004* (0.000063)	0.00 (0.00)	0.00 (0.01)	0.01 (0.01)	0.01 (0.02)
Hay	5	0.0008 (0.000703)	0.00 (0.01)	0.00 (0.02)	0.00 (0.03)	0.00 (0.06)
Tree fruits (fw)	9	0.0016 (0.00185)	0.01 (0.02)	0.02 (0.05)	0.02 (0.07)	0.05 (0.15)
Carrot root	13	0.0027* (0.000608)	0.01 (0.01)	0.03 (0.02)	0.04 (0.05)	0.08 (0.11)
Leafy vegetables	26	0.0042 (0.00255)	0.01 (0.04)	0.03 (0.09)	0.06 (0.13)	0.12 (0.21)
Cucurbitaceae	9	0.019* (0.00503)	0.07 (0.12)	0.17 (0.26)	0.27 (0.41)	0.55 (0.84)
Animal tissue	18	1.458* (0.278)5.80 (8.00)	13.1 (18.0)	21.9 (28.0)	47.4 (58.0)

aSoil/feed concentration values are intended to represent the following potential scenarios: 0–1 pg TEQ/g represents the likely concentrations found in forage crops grown in soil with minimal background PCDD/F contamination (Hulster and Marschner 1993); 0.1–4 pg TEQ/g represents the likely concentrations found in forage grown in sludge-amended soil; 1–10 pg TEQ/g is the typical range in sludge-amended agricultural soil; and the concentrations found in forage grown in highly contaminated soil (> 670 pg TEQ/g) (Hulster and Marschner 1993; Prinz et al. 1991); 15 pg TEQ/g represents the maximum concentration reported in sludge-amended soil (McLachlan and Reissinger 1990); 30 pg TEQ/g represents the maximum mean concentration reported in soil (not sludge amended) (Broman et al. 1990).

bCoefficient of relationship between food concentration and soil or feed concentration.

cValues in parentheses are standard error of the coefficient.

dValues in parentheses are upper 95% confidence limits of the increase in food concentration.

*Regression coefficient significant at p < 0.05.