How Total benzo(a)pyrene equivalents are calculated. Which parameters are used and how are NDs accounted for?

Created by: Andrew White

Modified on: Wed, 7 Nov, 2018 at 9:42 AM


Total benzo(a)pyrene equivalents calculated by multiplying the water concentration of individual carcinogenic PAH’s by a standardized Benzo(a)pyrene Equivalency Factor. These Equivalency Factors are order of magnitude estimates of carcinogenic potential and are based on World Heath Organization schemes. For ND (non-detect) samples a value of ½ the RDL is used in the calculations.


Benzo(a)pyrene Equivalency for Waters and soils

BAP equivalency = ([Benzo(a)anthracene] x 0.1) + ([Benzo(b/j)fluoranthene] x 0.1) + ([Benzo(k)fluoranthene] x 0.1) + ([Benzo(g,h,i)perylene] x 0.01) + ([Benzo(a)pyrene] x 1) +([Chrysene] x 0.01) + ([Dibenz(a,h)anthracene] x 1) + ([Indeno(1,2,3-cd)pyrene] x 0.1)



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