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Environmental fate & pathways

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According to a Mackay Level I model calculation the main target compartment for 1,2,3,4-tetrahydronaphthalene will be the atmosphere (94.6 %) followed by the hydrosphere (2.7 %), sediment and soil (1.3 % each). The experimental Henry’s Law constant of 138 Pa m3/mol at 20 °C indicates high volatility of 1,2,3,4-tetrahydronaphthalene from surface waters. With an experimental Koc of 501 l/kg, the sorption potential of 1,2,3,4-tetrahydronaphthalene to soil or sediment organic matter is expected to be moderate (Blume scale).

 

The rate constant for the OH sensitized photodegradation of 1,2,3,4-tetrahydronaphthalene was measured as (3.43 +- 0.06) x 1E-11 cm3/(molec. x s). At 500,000 OH radicals / cm3 (typical 24-hour mean in central Europe), this corresponds to a half-life of 11.2 hours. There are numerous publications indicating that tetrahydronaphthalene is biodegradable and it is used as carbon and energy source by several bacteria strains.Biodegradation and atmospheric OH sensitized photodegradation are expected to be the predominant ways of removal from the environment while photolytical or hydrolytical degradation in surface water are expected to be of minor importance. The partition coefficient 1-octanol/water of1,2,3,4-tetrahydronaphthaleneis log Kow = 3.78 at 23 °C, indicating a significant potential for bioaccumulation.