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Compound WHO 1998 TEF WHO 2005 TEF*
<br />chlorinated dibenzo-p-dioxins
<br />2,3,7,8-TCDD 1 1
<br />1,2,3,7,8-PeCDD 1 1
<br />1,2,3,4,7,8-HxCDD 0.1 0.1
<br />1,2,3,6,7,8-HxCDD 0.1 0.1
<br />1,2,3,7,8,9-HxCDD 0.1 0.1
<br />1,2,3,4,6,7,8-HpCDD 0.01 0.01
<br />OCDD 0.0001 0.0003
<br />chlorinated dibenzofurans
<br />2,3,7,8-TCDF 0.1 0.1
<br />1,2,3,7,8-PeCDF 0.05 0.03
<br />2,3,4,7,8-PeCDF 0.5 0.3
<br />1,2,3,4,7,8-HxCDF 0.1 0.1
<br />1,2,3,6,7,8-HxCDF 0.1 0.1
<br />1,2,3,7,8,9-HxCDF 0.1 0.1
<br />2,3,4,6,7,8-HxCDF 0.1 0.1
<br />1,2,3,4,6,7,8-HpCDF 0.01 0.01
<br />1,2,3,4,7,8,9-HpCDF 0.01 0.01
<br />OCDF 0.0001 0.0003
<br />non-ortho substituted PCBs
<br />PCB 77 0.0001 0.0001
<br />PCB 81 0.0001 0.0003
<br />PCB 126 0.1 0.1
<br />PCB 169 0.01 0.03
<br />mono-ortho substituted PCBs
<br />105 0.0001 0.00003
<br />114 0.0005 0.00003
<br />118 0.0001 0.00003
<br />123 0.0001 0.00003
<br />156 0.0005 0.00003
<br />157 0.0005 0.00003
<br />167 0.00001 0.00003
<br />189 0.0001 0.00003
<br />* Numbers in bold indicate a change in TEF value
<br />Reference - Van den Berg et al :
<br />The 2005 World Health Organization Re-evaluation of Human and
<br />Mammalian Toxic Equivalency Factors for Dioxins and Dioxin-like Compounds
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