Registration Dossier
Registration Dossier
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EC number: 202-046-9 | CAS number: 91-17-8
Endpoint summary
Administrative data
Description of key information
According to a Mackay level I calculation decahydronaphtalene will be distributed almost exclusively to the atmosphere (99.86 %) while distribution to other compartments is negligible (< 0.1 %).The measured Henry’s Law constant of 10740 Pa m3/mol at 20 °C indicates high volatility of decahydronaphtalene from surface waters. With a Koc of 1995 L/kg (HPLC), the sorption potential of decahydronaphtalene to soil or sediment organic matter is expected to be high (Blume scale).
The QSAR calculated rate constant for the OH sensitised photodegradation of decahydronaphthalene is 18.5246 E-12 cm3/molecule-sec. At 500,000 OH radical/cm3 (approximate 24 hour-mean in central Europe), this corresponds to a half-life of 21 hours. Although not readily biodegradable according to the guideline requirements, decahydronaphthalene can be metabolized by microorganism and thus it might be degraded in the environment. A simulation test in surface water according to OECD 309 resulted in a calculated half-life of 73.8 days for 1 µg/L test item and 72.5 days for 10 µg/L test item concentration. However, in a prolonged Closed Bottle test (enhanced biodegradability test) according to ISO 10707 and OECD 301D using natural surface water the test substance is biodegraded in excess of 63% at day 42.
Atmospheric OH sensitized photodegradation is expected to be the predominant way of removal from the environment while hydrolytical degradation in surface water is expected to be of minor importance. The partition coefficient 1-octanol/water of decahydronaphthalene is log Kow = 4.2, indicating significant potential for bioaccumulation.
Additional information
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