Registration Dossier
Registration Dossier
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EC number: 203-430-9 | CAS number: 106-75-2
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to the solid soil phase is not expected.
Key value for chemical safety assessment
Additional information
QSAR-disclaimer
In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met.
According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided.
For the assessment of oxydiethylene bis(chloroformate) (CAS 106 -75 -2, DIBIS) and its metabolite diethylene glycol (CAS 111-46 -6) (Q)SAR results were used for the estimation of the adsorption potential. The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.
Therefore, further experimental studies on the adsorption potential are not provided.
Assessment
As oxidiethylene bischloroformate (DIBIS, CAS 106-75-2) rapidly hydrolyses in contact with water (see IUCLID Ch. 5.1.2), the analysis of the parent compound is of low relevance. Nevertheless, the adsorption potential was assessed for DIBIS as well as its hydrolysis product diethylene glycol (DEG, CAS 111 -46 -6).
In accordance with column 2 of REACH Annexes VIII and IX, the study does not need to be conducted if based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or the substance and its relevant degradation products decompose rapidly. DIBIS has a log Kow of -0.34 (estimated; see IUCLID Ch. 4.7). Its hydrolysis product DEG (CAS 111 -46 -6) -1.98 (experimental; see IUCLID Ch.4.7).
In a ready biodegradability test with DEG (BASF AG 1994; report no. 94/1175/21/1; OECD 301A; see IUCLID Ch. 5.2.1), the adsorption control showed a maximum value of 1% removal by adsorption within the exposure period of 28 days. Therefore, adsorption is not to be expected.
In addition, the Koc was estimated for the uncharged moleculse using QSAR models. According to the MCI method of the KOCWIN v2.00 module of EPI Suite v4.11, DIBIS has a Koc of 10 L/kg (BASF SE, 2018), while DEG has a Koc of 1 L/kg (BASF SE, 2015). The MCI module is more reliable than the log Kow method of KOCWIN v2.00, which estimates the Koc based on the n-octanol/water partition coefficient. The latter method resulted in a Koc of 1.5 L/kg for DIBIS and 0.082 L/kg for DEG. It should be noted that both substances are not within the applicability domain of the MCI and the KOW method, as the number of occurrence of correction factors exceeds the maximum number of the training set.
It can be concluded that adsorption of DIBIS as well as its hydrolysis product DEG to the solid soil phase are not to be expected.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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