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where POC and DOC are the particulate and dissolved organic carbon concentrations
(kg•L -1 ) in dilution water, respectively. For the BCF values presented in the subsequent
tables, a DOC value of 2 mg/L and a POC of 0 mg/L are assumed which corresponds to
the acceptable concentration of total organic carbon that is specified in the OECD 305
bioconcentration test guideline. Since DOC has a lower affinity than POC, these
assumptions are expected to provide a conservative basis for evaluating bioavailability of
hydrocarbons in clean lab water relative to natural waters.
4.1 Normal Paraffins
Bioconcentration factor predictions for n-paraffins obtained using the regression method
(Figure 21) are above the B criterion of 2000 for the C14 n-paraffin, tetradecane. When
biotransformation is incorporated to the model, none of the predicted n-paraffin BCFs are
above 2000 (Figure 22). Dietary BCF values, which are typically more conservative than
aqueous BCF values, are above the criterion for C9, and C12-C14 (Table 11). In contrast,
aqueous BCF test data in the same carbon range are all below the criterion (Figure 23).
The elevated BCF prediction for tetradecane is confirmed by the BMF, which is near 1
(Figure 24). It can be concluded that based on the available data, only a C13 and C14 n-
paraffin have a BCF greater than 2000, and no n-paraffin has a BCF greater than 5000
(vB criterion). Thus the C13 and C14 n-paraffins may fulfill the B criterion but not the
vB criterion.
10000
BCF (regression)
1000
100
10
n-Paraffins
B
vB
1
0 5 10 15 20 25 30 35 40
Carbon Number
Figure 21. Predicted fish BCFs for n- paraffins using the regression-based approach in
BCFBAF. B – 2000, vB - 5000
30