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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
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 source
Reason / purpose for cross-reference:
read-across source
Reason / purpose for cross-reference:
read-across source
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
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 44 - <= 280 mg/L
Nominal / measured:
not specified
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
EC10
Effect conc.:
>= 34 mg/L
Nominal / measured:
not specified
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
>= 2.6 mg/L
Nominal / measured:
not specified
Conc. based on:
test mat.
Basis for effect:
growth rate
Conclusions:
Based on read across studies for toxicity to alga on chemically similar substances, for the target substance Fatty acids, C14-18 and C16-18-unsatd., ammonium salts the ErC50(algae, 72h) is estimated to be >44 mg/l (to <= 280 mg/l), the ErC10(algae, 72h): >=34 mg/L and the NOEC(algae, 72h): >=2.6 mg/L.

Description of key information

Based on read across studies for toxicity to algae on chemically similar substances, the target substance Fatty acids, C14-18 and C16-18-unsatd., ammonium salts the ErC50(algae, 72h) is estimated to be >44 mg/l  (to <= 280 mg/l), the ErC10(algae, 72h): >=34 mg/L and the NOEC(algae, 72h): >=2.6 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
44 mg/L
EC10 or NOEC for freshwater algae:
2.6 mg/L

Additional information

Several publications are available in which the toxicity to aquatic algae of the analogue substances (Sodium oleate, Sodium myristate, Sodium stearate, Sodium palm kernel soap, Sodium tallow soap) were determined. The test took 72 hours. As results, the following (lowest) ErC50 values were determined: 58 mg/L for Sodium oleate, >44 mg/L for Sodium myristate, 150 mg/L for Sodium stearate, 195 mg/L for Sodium palm kernel soap and 280 mg/L for Sodium tallow soap. As another result, the lowest ErC10 value was found to be 34 mg/L and the lowest NOEC was determined to be 2,6 mg/L.

Based on the structural similarity of the target substance to the analogue substances, the results of the  toxicity to aquatic algae of the source substances can be assigned to the target substance.

The supporting information of the toxicity to aquatic algae of the analogue substances sodium laurate (ErC50(algae, 72h): 53 mg/l) and sodium behenate (ErC50(algae, 72h): 500mg/l) are given but areless appropriated for the read-across projection to toxicity to aquatic algae of the target substance (because laurate and behenate are only impurities).