Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Hydrolysis:

Considering the hydrolytic stability of the test substance, it should not be expected that hydrolytic processes will contribute to its degradation in the environment.

Degradation:

Abiotic degradation:
In the atmosphere Monomethylamine is expected to be indirectly photodegraded with a half life of 17 hours (EPISuite v3.20). Photodegradation tests in water and soil is no requirement under REACH. Hydrolysis is not expected under environmental conditions.

Biodegradation:
In laboratory tests ready biodegradability under aerobic conditions was demonstrated for Monomethylamine. Additionally, according to an EPIWIN calculation the substance is considered to be readily biodegradable under aerobic as well as under anaerobic conditions.

Bioaccumulation:

Monomethylamine has a very low potential for bioaccumulation in aquatic organisms.

Adsorption / Desorption:

In 1991 van Oepen et al. investigated the adsorption of monomethylamine in the media water – soil and stated that the substance does not absorb into soil in detectable amounts.

Wang and Lee (1993) determined the adsorption coefficients for three different substrates (Montmorillonite, Kaolinite, and marine sediment) in a batch-equilibrium experiment. Adsorption of amines by montmorillonite and kaolinite is consistent with control by electrostatic attraction as well as by van der Waals forces. Adsorption of amines could be an important control on the distribution of these organic compounds in sediment porewaters. Adsorption of amines by both clays and FP sediment was essentially a reversible process. The adsorption coefficients for each of the substrates are given as 7.0 mL/g (Montmorillonite), < 1mL/g (Kaolinite), and 3.5 mL/g (marine sediment), respectively.

The years before the same authors published an article about the distribution and adsorption of aliphatic amines in marine and lacustrine sediments. They found that methylated amines can be adsorbed onto marine sediments with adsorption coefficients ranging from 2.4 - 4.7. Salinity significantly reduces the adsorption of amines onto freshwater sediments. Removal of amines from unpoisoned seawater can occur by bacterial uptake (incorporation plus respiration) as well as by adsorption to solids. The overall recovery using [14C]-radiolabelled monomethylamine was greater than 95 %. 

Additionally, a calculation of the Kocand logKocvalue for monomethylamine was performed with the help of the US-EPA computer program EPISuite v3.20 in 2000. As result a Kocof 8.098 and a logKocof 0.9084 are given, respectively.