Registration Dossier
Registration Dossier
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EC number: 238-925-9 | CAS number: 14858-73-2
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air
Bis(2-ethylhexyl) carbonate entering the atmosphere will be relatively quickly photodegraded by reaction with OH radicals. Based on a OH radical concentration of 5E05 radicals/cm³ (24 -h d) and a reaction rate constant k(OH)=21.8130E-12 cm³/molecule x sec an atmospheric half-life t1/2=17.7 h at 25°C can be calculated. The photodegradation of Bis(2-ethylhexyl) carbonate in air via OH radicals was calculated using EPIWIN v3.20, AOPWIN v1.92.
Henry's Law Constant of Bis(2-ethylhexyl) carbonate was calculated using EPIWIN v3.20, HENRYWIN v3.10 (bond method). The calculation yielded a very high value: H=0.0328 atm x m³/mole corresponding to H=3322.6 Pa x m³/mole at 25°C. This result indicates that Bis(2-ethylhexyl) carbonate would be highly volatile from aqueous solution. Due to missing information about the applicability of the calculation model in respect to the substance under investigation the results should be treated with care.
Taking into account a high Henry's Law constant the derivates will migrate in the gas phase of the atmosphere in appreciable amounts, therefore this elimination path will be of high importance.
Hydrolysis
According to REACH Regulation (Annex VIII, 9.2.2.1, column II), the study on hydrolysis needs not to be performed as the water solubility of the test substance is <1 mg/L at 20°C and the test substance is proved to be readily biodegradable.
Biodegradation
The test substance Bis(2-ethylhexyl) carbonate is readily biodegradable fulfilling the 10 -day window criterion.
In a study performed according to the OECD Guideline 301 F "Manometric Respirometry Test“ the biodegradation of the test substance was found to be 83% and 67% (at a concentrations of 20 mg/L and 100 mg/L respectively) after 28 days. For a concentration of 20 mg/L biodegradation within the 10-day-window was found to be 78%.
In a study performed according to OECD Guideline 301B 'Modified Sturm Test/CO2 Evolution Test the test substance (at test concentrations of 20 mg/L) proved to be readily biodegradable but failing the 10-d window criterion (60 -85% biodegradation after 28 days).
At the tested concentrations no inhibitory effects of the test substance were observed.
Based on the results of Manometric Respirometry test no significant abiotic degradation of the test substance was noticeable after 28 days of incubation.
Bioaccumulation
According to REACH Regulation (Annex IX, 9.3.2, column II), testing for bioaccumulation in aquatic species doesn't need to be conducted as the substance under investigation has a low potential to cross biological membranes and direct and indirect exposure of the aquatic compartment is unlikely.
Adsorption/desorption
In a study conducted according to OECD Guideline 106 (Preliminary Tests) soil sorption coefficients (Koc) from 96230 (log Koc= 4.98) to 3009119 (log Koc= 6.48), depending on the soil type, were obtained. Based on the results of the study a very high sorption onto soil organic matter is to be expected.
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