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Experimental BMF
10
1
Polynaphth. Dietary BMF
BMF = 1
0.1
15 16 17 18 19 20
Carbon Number
Figure 40. Experimentally derived fish BMFs for polynaphthenic hydrocarbons from
dietary bioaccumulation studies
4.6 Mono-Aromatics
Regression method BCF predictions for mono-aromatics (Figure 41) are above the B
criterion of 2000 for structures ranging from C12 to C17. When biotransformation is
incorporated to the model, none of the BCF predictions are above 2000 (Figure 42).
Dietary BCF values, which are typically more conservative than aqueous BCF values, are
below the B criterion for all tested structures (C9 to C16) except 1,3,5-tris(1-
methylethyl)-benzene (triisopropyl benzene, Table 16). However, this compound is not
representative of petroleum hydrocarbon structures and is therefore not used for B
assessment of this HCB. Aqueous BCFs for all other monoaromatics are below 2000.
Experimental BMF factors derived from dietary data (Figure 44) are consistently well
below 1. It can be concluded that based on the available data, mono-aromatic
hydrocarbons, as a class, are neither bioaccumulative nor very bioaccumulative.
BCF (regression)
100000
10000
1000
100
10
Monoaromatics
B
vB
1
5 10 15 20 25 30 35
Carbon Number
Figure 41. Predicted fish BCFs for mono-aromatic hydrocarbons using the regressionbased
approach in BCFBAF. B – 2000, vB - 5000
43