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criterion. It can be concluded that, based on the conservative use of experimental results
for diisopropyldecalin, some di-naphthenic structures at or above C16 may have halflives
above the persistence criterion.
10000.0
bioHCwin half-life (days)
1000.0
100.0
60 d half-life
10.0
1.0
0 5 10 15 20 25 30 35 40
Carbon number
Figure 7. Half-life predictions for di-naphthenic hydrocarbons using the US EPA model
BioHCwin
BioHCwin
Predicted
Half-Life
(days)
Measured
Seawater
Half-Life
(days)
Measured
Freshwater
Half-Life
(days)
Hydrocarbon
C nr
decahydronaphthalene
(decalin)
10 68.6 66.0
2,6-dimethyldecalin 12 33.1 10.0
bicyclohexyl 12 27.0 15.0 7.9
2,3,6-trimethyldecalin 13 23.0 33
2-isopropyldecalin 13 74.4 20
n-propyldecalin 13 64.6 20
1, 4, 6, 7- tetramethyldecalin 14 15.9 22
2,7-diisopropyldecalin 16 80.8 >191.0
Table 4. Predicted and experimental marine and freshwater half-life values for dinaphthenic
hydrocarbons (in bold, structure names for which BioHCwin predicts halflives
above 60 days; rows in orange show experimental values above 60 days)
15