I-TEFInternational Toxicity Equivalency Factor
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We used international TEF (I-TEF) values and WHO TEF values (Table 2) to calculate the TEQs of the dioxins and furans in breast milk (our values are based on I-TEF values).
Table 1 - international toxic equivalent factors (I-TEF) for the congeners of the chlorinated dioxins and furans Dioxin congener I-TEF Furan congener I-TEF 2,3,7,8-tetra CDD 1 2,3,7,8-tetra CDF 0.
Multiplication of the concentration of an individual CDD or CDF by its I-TEF gives a 2,3,7,8-TCDD (tetra CDD) toxic equivalent quantity (I-TEQ).