Registration Dossier
Registration Dossier
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EC number: 939-682-8 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Depending on local conditions and existing concentrations, disturbances in the biodegradation process of activated sludge is not expected.
Key value for chemical safety assessment
Additional information
As no microorganism study is available for assessing the toxicity of the substance, 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 the pure homologues (Alkyl Betaine C10, C12, C14) 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.
The results of biodegradation tests of several Alkyl Dimenthyl Betaine exhibit the readily biodegradability of the substance (for details see IUCLID section 5.2.1). Furthermore, no toxicity of the Alkyl Dimethyl Betaine was shown in the biodegradation tests. The results of a respiration test conducted with the substance EC 931-700-2 showed a NOEC ≥ 100 mg/L (Painter, 1978) and ≥ 30 mg/L for the active ingredient.
Therefore, depending on local conditions and existing concentrations, disturbances in the biodegradation process of activated sludge is not anticipated.
Additionally, a Pseudomonas putida test (Stuhlfauth, 1993) according to DIN 38412, part 8 is available for EC 931-700-2. The EC10 for Pseudomonas putida is 332 mg/L (100 mg/L for active ingredient) and the revealed EC50 is greater than 2000 mg/L (> 600 mg/L for active ingredient).
Based on the results above, the substance can be regarded as acutely not harmful to Pseudomonas putida and inhibition of activated sludge is not expected.
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