Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability:

According to Kollig et al., 1993 and Boethling & Mackay, 2000, hydrolysis is not expected to be a relevant degradation process due to the absence of hydrolysable groups. In addition the substance is readily biodegradable according to OECD criteria.

After evaporation or exposure to the atmosphere, the substance is expected to photodegrade rapidly by reaction with OH-radicalswith a half-life of 4.8 hours (24 -h day, 500000 OH/cm3; EPIWin, AOP v1.92, 2008).

Biodegradation:

Diethylamine turned out to be readily biodegradable in ready tests according to OECD TG.

Bioaccumulation:

Based on the 1-octanol/water partition coefficient (log Kow of 0.58, Hansch & Leo (1985)) an accumulation of the test substance in organisms is not to be expected.

Transport and distribution:

A calculated log Koc of 1.66 is available referring to the uncharged molecule (BASF AG, SRC PCKOC v1.66, 2008). However, the PCKOC-model may underestimate adsorption to organic carbon since it does not consider the ionic structure of the molecule. Under environmental conditions (pH 5 - 9) the test substance is almost completely present in its charged form (as calculated by the formula % ionised = 100/(1+10(pKa - pH)): 99% at a pH of 9, 100% at lower pH values). In a calculation conducted according to a publication by Franco & Trapp (2008) using the parameters pKa = 11.09 and log Pow = 0.58 a log Koc value of 1.92 (Koc 84, pH 7.0) was determined.