Toxic Equivalency Factors (TEFs)

• Developed For Risk Assessment

• Interpret Complex Database Derived From Analysis Of Samples Containing Mixtures Of PHAHs

• Express Quantitatively The Toxicity Of A Congener In Terms Of An Equivalent Concentration Of TCDD (RELATIVE POTENCY)

• Interim Approach

• ? ([Congener] x TEF)PCDD/DF/CB = TEQ

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