Registration Dossier
Registration Dossier
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EC number: 271-685-3 | CAS number: 68604-33-1 This substance is identified by SDA Substance Name: C14-C18 and C16-C18 unsaturated alkyl carboxylic acid ammonium salt and SDA Reporting Number: 04-006-01.
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- Read-across (analogue): For justification of read-across see section 13.2.
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across: supporting information
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 93
- Sampling time:
- 28 d
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- 92
- Sampling time:
- 28 d
- Details on results:
- BOD/COD, 10 d: 85-100% (supporting read-across substances).
- Interpretation of results:
- readily biodegradable
- Conclusions:
- The target substance is readily biodegradable (OECD Guideline 301B(28d): 93%, the “10-days-window” was met; OECD Guideline 301D(28d): 92% ).
Reference
Description of key information
Based on read across studies for biodegradability on chemically equal or similar substances the target substance Fatty acids, C14 -18 and C16 -18 -unsatd., ammonium salts is readily biodegradable (OECD Guideline 301B(28d): 93% (the “10 -days-window” was met); OECD Guideline 301D(28d): 92% ).
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Biodegradation in water: The biodegradability in water of the target substance Fatty acids, C14-18 and C16-18-unsatd., ammonium salts shall be derived from a structural analogue (read across substance).
A CO2 Evolution test according to OECD guideline 301B was conducted for the similar test substance "Ammoniumoleat-Paste" which contains ammonium laurate, ammonium myristate, ammonium palmitate, ammonium stearate, ammonium oleate and ammonium linoleate. The biodegradation rate (CO2 evolution) was determined as 93% within 28d.
A closed bottle test was conducted according to OECD guideline 301D to assess the biodegradation rate of the analogue substance 9-Octadecenoic Acid (Oleic acid) within 28 days. The biodegradation rate (given as BOD /COD *100) was calculated to be 76 % after 7 days and 92 % within 28 days for the test substance, which therefore is concluded to be readily biodegradable.
The structural similarity of the target substance and the analogue substances is so high that the results of the biodegradability of the source substances can be assigned to the target substance.
The supporting information of the biodegradation of the analogue substances sodium oleate, sodium stearate and sodium laurate also indicate to the readily biodegradability of the target substance (ammonium salts of C14 -18 -fatty acids).
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