Registration Dossier
Registration Dossier
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EC number: 918-139-9 | CAS number: 1228577-90-9
Endpoint summary
Administrative data
Description of key information
Phototransformation in air
Estimated half-lives for the components of this UVCB substance range from 1.0 to 1.8 hours.
Hydrolysis
Ether bonds are stable and do not hydrolyse to a significant extent at environmental relevant condition. This has been confirmed in an OECD 111 study with the structurally related substance Diaminotoluene, ethoxylated and propoxylated (CAS# 67800-94-6) in which the substance was stable at pH 4, 7, 9 at 50 degrees Celsius during 120 hours (Bayer Material Science AG, 2009).
Biodegradation
Biodegradation in water was tested in two ready biodegradability studies according to OECD 301F and one inherent biodegradability study according to OECD 302B. Diaminotoluene, propoxylated showed 23% biodegradability in the first ready biodegradability test (Bayer, 2002) and 9% biodegradability in the second ready biodegradability test (ISOPA, 2003) . In the OECD302B test, 22% degradation was observed after 27 days. The substance is classified as "not readily biodegradable". The substance exhibits inherent (primary) biodegradability, and therefore is not expected to persist indefinitely in the environment. Structure activity relationship models (OASIS Catalogic 301C and OASIS Catalogic 301F) were used to predict potential biodegradation daughter products from three representative components of the UVCB substance. The prediction results provide additional evidence that neither the parent compounds nor biodegradation daughter products will persist indefinitely in the environment.
Bioaccumulation
The substance is considered to have very low potential for bioaccumulation based on a log Kow ≤3 and a predicted log BCF ≤0.5 using three QSAR models.
Adsorption/desorption
The adsorption/desorption potential of the UVCB substance was determined using five soils in an OECD 106 study (key study). The organic carbon-normalized partition coefficients of three representative components of the UVCB substance (o-TDA-3PO, o-TDA-5PO, o-TDA-8PO) were determined. The Koc values in five soils ranged from 3171 to 95329, from 3250 to 75429, and from 8368 to 147348 ml/g for o-TDA-3PO, o-TDA-5PO, and o-TDA-8PO, respectively. The average Koc values across five soils were 40054 ml/g (logKoc of 4.60), 35972 ml/g (logKoc of 4.56), and 59682 ml/g (logKoc of 4.78) for o-TDA-3PO, o-TDA-5PO, and o-TDA-8PO respectively. The three components of the UVCB substance showed a comparable adsorption behavior related to a respective soil. An overall weighted average Koc for the UVCB substance was calculated to be 41032 (logKoc of 4.61).
Additional information
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