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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Study period:
72 hours
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Performed to current guidelines and well reported.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
ISO 10253 (Water quality - Marine Algal Growth Inhibition Test with Skeletonema costatum and Phaeodactylum tricornutum)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid
Details on test material:
Commercial grade containing approximately 45% actives
Specific details on test material used for the study:
TEST MATERIAL: SRK 184/14
Batch / Lot: NBN
Activity ca 60%

Sampling and analysis

Analytical monitoring:
not specified

Test solutions

Vehicle:
yes
Details on test solutions:
Supplied as water-based mixture, ca 40% actives

Test organisms

Test organisms (species):
Skeletonema costatum

Study design

Test type:
static
Water media type:
saltwater
Limit test:
no
Total exposure duration:
72 h

Test conditions

Test temperature:
20 C

Results and discussion

Effect concentrationsopen allclose all
Duration:
24 h
Dose descriptor:
EC50
Effect conc.:
ca. 47 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
ca. 678 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
ca. 1 490 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
ca. 600 mg/L
Nominal / measured:
nominal
Conc. based on:
act. ingr.
Basis for effect:
growth rate
Details on results:
The substance appeared to inhibit growth initially, but the effect was quickly reduced, most likely as a result of degradation of the substance to succinic acid derivatives and triethanolamine.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
The substance appeared to inhibit growth initially, but the effect was quickly reduced, most likely as a result of degradation of the substance to succinic acid derivatives and triethanolamine.