Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The adsorption potentialof Dihydromyrcenyl acetate is 2468 L/kg based on read-across from Dihydromyrcenol (CAS# 18479 -58 -8). For Dihydromyrcenol, data is available from a HPLC screening study according to OECD TG 121 and in compliance with GLP criteria. From this study a log Koc of 2.25 was determined. The respective Koc value is ca. 178 L/kg. The log Koc is corrected: log Koc Dihydromyrcenyl acetate = log Koc Dihydromyrcenol * (log Kow Dihydromyrcenyl acetate/log Kow Dihydromyrcenol) = 2.25 * (4.9/3.25) = 3.39. The respective Koc value for Dihydromyrcenyl acetate is 2468 L/kg.

The Henry's law constantis calculated using the equation from EUSES. Using a molecular weight of 198.3 g/mol, and the experimentally determined vapour pressure of 14.4 Pa (at 24 °C) and water solubility of 6.1 mg/L (at 24 °C) the Henry's Law constant at environmental temperature (12 °C) is calculated to be 236 Pa·m³/mol.

Based on Level III environmental distribution modellingusing EPISUITE (assuming equal and continuous releases to air, water and soil) using the CAS number 53767 -93 -4 and the measured physico-chemical parameters (water solubility = 6.1 mg/L, vapour pressure = 0.108 mm Hg and log Kow = 4.9) as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (62.2%) and water (33.7%) with minor amounts to air (3.29%) and sediment (0.785%).

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant (STP). Model calculations show that 49.6% of the substance will be degraded and that 26.9%, 17.1% and 6.39% will partition to air, sewage sludge and water, respectively.

Additional information

Categories Display