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100.0
Half-life predicted (days)
10.0
Freshwater
P criterium
Marine Water
1.0
1.0 10.0 100.0
Half-life observed (days)
Figure 12. BioHCwin (Y-axis) vs. experimental half-lives (X-axis) for mono-aromatic
hydrocarbons
3.7 Naphthenic Mono-Aromatics
The BioHCwin model predicts that half-lives for naphthenic mono-aromatic
hydrocarbons above C14 will be higher than 60 days (Figure 13). In several cases, there
are data for multiple hydrocarbons with the same number of carbons. Half-life
predictions for three-ring and higher hydrogenated polycyclic aromatic hydrocarbons
significantly exceed the persistence criterion. However, experimental freshwater and
marine half-lives for naphthenic mono-aromatics up to C18 range from 1.9 to 38 days
(Table 7), showing that the BioHCwin model predictions are again overly conservative
(Figure 14). Based on the available data it can be concluded that some naphthenic monoaromatic
structures at or above C19 may have half-lives above 60 days.
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