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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Endpoint:
short-term toxicity to aquatic invertebrates
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
The target substance is hydrolytically unstable with hydrolysis half-life less than 5 minutes. The hydrolysis products have been identified to be 1-butanol and hydrated zirconium dioxide. The properties and toxiciteis of the hydrolysis products are therefore used for read-across.
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Qualifier:
according to
Guideline:
other: DIN 38412 Part 11, Daphnia- Short term test
Principles of method if other than guideline:
DIN 38412 Part 11, Daphnia- Short term test
GLP compliance:
not specified
Analytical monitoring:
not specified
Test organisms (species):
Daphnia magna
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
ca. 1 983 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC100
Effect conc.:
ca. 2 455 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC0
Effect conc.:
ca. 1 983 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Validity criteria fulfilled:
yes
Conclusions:
The 48h EC50, flow though method, tesed on Daphnia magna was 1983 mg/l for 1-butanol

Description of key information

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
1 983 mg/L

Additional information

No studies were conducted on the target substance, Zirconium tetrabutanolate. As the target substancehydrolyses rapidly (half-life < 5 minutes) the intrinsic properties are related to hydrolysis products of thetarget substance.

On the basis that if entering the environmental, this substance will quickly dissociate to form the inorganic (poorly soluble) zirconium dioxide and well-evaluated organic substances - 1 -butanol.
The zirconium dioxide is not considered further in this report as aquatic toxicity assessments do notapply.
E
C50 (48h) values tested on Daphnia magna were 1983 mg/l for 1 -butanol (Kuehn, et al. 1989). This value was used for CSA.