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Environmental fate & pathways

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Since RAV 7NG contains as main ingredient 'diallyl 2,2'oxydiethyl dicarbonate' and experimental data are lacking for RAV 7NG, the experimental data from 'diallyl 2,2'oxydiethyl dicarbonate' were used in a read-across approach.

Justification for read-across from supporting substance RAV 7AT (diallyl 2,2'-oxydiethyl dicarbonate; CAS 142-22-3; EC 205-528-7): about 70 % of RAV 7NG (EC 700-483-4) consists of components that can be found in the commercial ADC grades known as RAV 7AT, Nouryset 200 and CR39. Merely from comparing the similar production processes of these two substances it is apparent that RAV 7AT and RAV 7NG are closely related to each other.  Finally, the physical-chemical, toxicological and ecotoxicological properties of RAV 7NG and RAV 7AT are almost equal and as a result, read across is justified.

The adsorption / desorption properties of Diallyl-2,2`-oxydiethyl dicarbonate have not to be experimentally determined in accordance with REACH regulation, Annex VIII, column 2. The reason is the low logPow of 1.54, indicating that the substance can be expected to have a low potential for adsorption. For completeness the organic-normalized sorption coefficient for soil (Koc) was calculated with the help of the computer program EPIWIN software KOCWINv2.00 by US-EPA (Chemservice S.A., 2010). This tool utilizes two different models: the Salbjic molecular connectivity (MCI) method with improved correction factors (and therefore taken more seriously into account) and the traditional method, which is based on the logarithmic octanol-water partition coefficient, logKow. Regarding the MCI method a value of 20.69 L/kg is reported, whereas the traditional method gives a result of 16.9 L/kg.

The substance specific Henry´s Law Constant was also determined by calculation using the EPIWIN software HENRYWINv3.20 by US-EPA (Chemservice S.A., 2010). It was only possible to receive a result with the help of the Bond Method, which was 1.88 E-002 Pa*m³*mol-1. The Group Method showed an incomplete result.