Registration Dossier
Registration Dossier
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EC number: 224-081-9 | CAS number: 4196-89-8
Endpoint summary
Administrative data
Description of key information
Additional information
Hydrolysis:
2,2-Dimethylpropane-1,3-diyl dibenzoate is found to be stable at 50 °C and pH 4 and 7. At 50 °C and pH 9 abiotic degradation of 2,2-dimethylpropane-1,3-diyl dibenzoate was observed. Benzoic acid could be identified as the main hydrolysis product (hydrolyzed at 50 °C and pH 9). The calculated mean value of half-life time and hydrolysis rate at 25 °C and pH 9 using the Arrhenius equation are 394.57 hours (16.4 days) and 4.8958E-07 1/s, respectively.
Biodegradation:
2,2-Dimethylpropane-1,3-diyl dibenzoate is biodegradable when using unadapted inoculum from a wastewater treatment plant treating predominantly domestic sewage as shown in a Manometric Respirometry Test (OECD TG 301d, 60.2 % after 28 days). The pass level of biodegradation of 60% removal of ThOD was reached, but the 10 day window was failed. 2,2-dimethylpropane-1,3-diyl dibenzoate showed a degradation of 72 % after 40 days. Overall, 2,2-dimethylpropane-1,3-diyl dibenzoate is considered to be "Readily biodegradable, but failing the 10 day window".
Bioaccumulation
2,2-Dimethylpropane-1,3-diyl dibenzoate was not tested for bioaccumulation. A log Kow of 4.7 indicates a bioaccumulation potential. However, a QSAR using the Estimation Program Interface (EPI) Suite v4.11 of the U. S. Environmental Protection Agency yields a BCF of 566.3 L/kg which is far below the trigger value for the PBT assessment. Therefore, the experimental study was waived.
Adsorption/desorption:
The QSAR determination of the carbon partition coefficient for 2,2-dimethylpropan-1,3-diyl dibenzoate using the model KOCWIN included in the Estimation Program Interface (EPI) Suite v4.11 revealed KOC values of 2475 L/kg (log Kow method) and 5354 L/kg (MCI method) for the unaffected molecule of 2,2-dimethylpropan-1,3-diyl dibenzoate.
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