Registration Dossier
Registration Dossier
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EC number: 939-682-8 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
As no studies are available for assessing the aquatic toxicity of the target substance EC 939 -682 -8, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 Grouping of substances, a read-across to the structurally related alkyl dimethyl betaine (EC 931-700-2) and cocoamidopropyl betaine was applied. The read across is justified due to the structural similarity of the analogue substances and similar physico-chemical properties resulting in a similar environmental fate and ecotoxicity profile. Further justification is given in the analogue justification attached to section 13 in IUCLID.
Ecotoxicological data are available for three trophic levels for alkyl dimethyl betaine and the cocoamidopropyl betaine. Both substance exhibits E(L)C50 values for all trophic levels and long term NOEC values for algae in a similar range (1 mg/L < E(L)C50 < 10 mg/L; 0.1< NOEC <1 mg/L). The chronic values for fish available for cocoamidopropyl betaine are in the same range as the chronic values for algae. For alkyl dimethyl betaine a long term study for Daphnia magna is available. The NOECs for reproduction based on a.i. and the test item proper are <= 10 mg/L.
According to the results obtained in biodegradation studies of alkyl dimethyl betaine, the target substance can be regarded as readily biodegradable under aerobic conditions. Thus, the inhibition of the degradation activity of activated sludge is not anticipated, as the target substance is considered to be readily biodegradable and shows no toxicity to microorganisms.
For alkyl dimethyl betaine, no chronic fish toxicity value is available whereas for cocoamidopropyl betaine, chronic toxicity data are available for three trophic levels. For cocoamidopropyl betaine chronic toxicity data are available for three trophic levels. Using these chronic values in the risk assessment is sufficiently adequate for a conservative risk assessment. Therefore, the lowest long-term NOEC of 0.135 mg/L for fish from cocoamidopropyl betaine is used for PNEC derivation.
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