Body burden
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body burden, the total amount of a chemical in the body. Average body burden of total sum of PCBs in industrialised countries range from less than 10 mg to 50 mg (ΣPCB) per person (less than 1 to 5 mg/kg [ΣPCB in fat]). Average daily intake of the sum of PCBs is 0.2 µg/kg b.w. or 14 µg per person. Average body burden of dioxins in young western European population is 100-200 ng (TEq) per person (0.000,000,1 - 0.000,000,2 g [TEq]); it can also be expressed as 10-20 ng/kg (TEq in fat) (Figure 2), in 60-year-old population 500-1000 ng (TEq per person). In steady state (see this) the body burden is about 5000 times the daily intake of dioxins. Average daily intake in many countries (see also PCDD/F - sources) is 1 to 2 pg I-TEq/kg b.w. or about 100 pg (0.1 ng or 0.000,000,000,1 g) per person (note that PCBs are given as the total sum of congeners whereas PCDD/Fs are given as TEq, see TEq and units).
Figure 2. PCDD/F body burden in some countries measured from human milk samples of primipara mothers. (Data from the second round of WHO-coordinated exposure study, 1993.)