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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Endpoint:
toxicity to aquatic algae and cyanobacteria
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
As the target substance hydrolyses rapidly (half-life < 30 minutes) the intrinsic properties are related to hydrolysis products of the target substance. This information is used as a supporting evidence on the toxicity of the target substance in CSA.
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
according to
Guideline:
other: German Industrial Standard DIN 38412 part 9
GLP compliance:
not specified
Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
ca. 512 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. 216 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Validity criteria fulfilled:
yes
Conclusions:
The EC50 of triethanoamine was 512, 216 mg/L in neutralized and non-neutralized systems.

Description of key information

Key value for chemical safety assessment

EC50 for freshwater algae:
512 mg/L

Additional information

No studies were conducted on the target substance, Tetrakis [[2,2',2"-nitrilotris[ethanolato]](1-)-N,O]zirconium. As the target substance hydrolyses rapidly (half-life < 30 minutes) the intrinsic properties are related to hydrolysis products of the target substance.

On the basis that if entering the environmental, this substance will quickly dissociate to form the inorganic (poorly soluble) zirconium dioxide and 2,2',2''-Nitrilotriethanol (triethanolamine). The zirconium dioxide is not considered further in this report as aquatic toxicity assessments do not apply.

Short-term toxicity studies of triethanolamine are well-investigated:

Fish: LC50 (96h), Pimephales promelas, was 11800 mg/l (Geiger, D.L. et al., 1985)

Invertebrates: EC50 (24h) Daphnia magna, was 1850 mg/l (Bringmann 1982)

Algae or cyanobacteria: EC50 (72h),Desmodesmus subspicatus, was 512 mg/l (Aman and Steinhaeuser, 1986)

Microorganisms: IC50 (3h), activated sludge, > 1000 mg/l (Klecka, et al. 1985).