Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Alkyl dimethyl betaines including the registered substance Betaines, C12-14 (even numbered)-alkyldimethyl are amphoteric surfactants. Amphoterics are surfactants with ionic charge. Depending on the pH value they can change between anionic character, the isoelectric neutral stage or the cationic character (van Ginkel, 1995). Amphoteric surfactants show stability against electrolytes, acids, alkalis, and water hardness. They are compatible with anionic, cationic and non-ionic surfactants (Garcia, 2008). Regarding biodegradation, alkyl dimethyl betaines have been proved as readily biodegradable under aerobic condition according to OECD critera. Therefore, it is concluded that hydrolysis neither is an important process in the fate of these amphoteric surfactants. The measured log Pow of -0.4 for Betaines, C12-14 (even numbered)-alkyldimethyl ( EC No. 931-700-2) and the calculated bioconcentration factor (BCF) of 70.79 for several alkyl dimethyl betaines rules out appreciable bioaccumulation.