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Mar 21, 2011 - Renewable Energy Projects On Tribal Land by Blaine I. ... Tribal lands have many inherent advantages for
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The TEF represents a ratio of the toxicity of a PAH congener to that of B(a)P. The use of TEFs allows the concentration of PAHs other than BaP to be converted to ...
Advisory Note Classification of polycyclic aromatic hydrocarbons Polycyclic (or polynuclear) aromatic hydrocarbons (PAHs) comprise a group of similar organic compounds comprised of at least two benzene rings. They typically result from the incomplete combustion of organic material (such as coal, petrol, diesel, and wood). PAHs are toxic and carcinogenic. The degree of toxicity and carcinogenicity is dependent on which type (or congener) of PAH it is. PAHs typically occur in mixtures and it is therefore difficult to establish the risk that the mixture may pose. One method to allow a risk assessment to be undertaken is the use of toxic equivalence factors (TEFs). These allow the toxicity of a mixture of PAHs to be expressed as a single number representing the equivalent concentration of the most toxic or carcinogenic congener. Benzo(a)pyrene (B(a)P) is generally considered the most toxic and carcinogenic PAH. The TEF represents a ratio of the toxicity of a PAH congener to that of B(a)P. The use of TEFs allows the concentration of PAHs other than BaP to be converted to equipotent concentrations of B(a)P(toxic equivalent). For example, the potency of a PAH having a TEF of 0.01 and having a TCLP concentration of 0.088 mg/L, would have a B(a)P toxic equivalent of 0.000880mg/L. The TEQ (toxic equivalent) is calculated by adding the product of the concentration and individual TEF values of each PAH congener. TEFs are applied to all the PAH concentrations in the sample and the sum of these is then compared with the criteria for BaP in Table 2 of IB105. The TEFs for individual PAHs are Congener Benzo(a)pyrene Dibenz(a.h)anthracene Benz(a)anthracene Benzo(b)fluoranthene Benzo(k)fluoranthene Indeno(1.2.3.cd)pyrene Chrysene 0.01 Benzo(g.h.i)perylene
In the case where a result is reported as less than limit of reporting (LOR) the LOR should be used to calculate the TEQ for that congener. For example if a sample concentration for chrysene was reported as
![Advisory Note for classification of PAHs[5]](https://m.moam.info/img/260x300/advisory-note-for-classification-of-pahs5_5a6baf9b1723dd0a74d79fb6.jpg)
