I-TEF

AcronymDefinition
I-TEFInternational Toxicity Equivalency Factor
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International Toxicity Equivalency Factor (I-TEF) Method of Risk Assessment fo rComplex Mixtures of Dioxins and Related Compounds.
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 0.1 1,2,3,7,8-penta CDD 0.5 2,3,4,7,8-penta CDF 0.5 1,2,3,7,8-penta CDF 0.05 1,2,3,4,7,8-hexa CDD 0.1 1,2,3,4,7,8-hexa CDF 0.1 1,2,3,6,7,8-hexa CDD 0.1 1,2,3,7,8,9-hexa CDF 0.1 1,2,3,7,8,9-hexa CDD 0.1 1,2,3,6,7,8-hexa CDF 0.1 2,3,4,6,7,8-hexa CDF 0.1 1,2,3,4,6,7,8-hepta CDD 0.01 1,2,3,4,6,7,8-hepta CDF 0.01 1,2,3,4,7,8,9-hepta CDF 0.01 1,2,3,4,6,7,8,9-octa CDD 0.001 1,2,3,4,6,7,8,9-octa CDF 0.001
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).